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Gio n vt l 9Trng THCS Tn AnGing: 9A:..9B:..Tit 1:
HNG DN S DNG SCH GIO KHOA, TI LI UV PHNG PHP HC TP B MN
I - Mc tiu :
1. Kin thc :- Bit c ni dung chnh cc chng, cc phn s hc trong chng trnh SGK- Bit c !t s" t#i $i%u th&! 'h(o ph)c *) cho hc t+p !n- Bit c !t s" phng php hc t+p !n
2. K nng:- B.c u c/ '0 n1ng 'h&i thc s2 d)ng SGK, t#i $i%u th&! 'h(o- S2 d)ng c !t s" 3 d4ng, d)ng c) o 5 c $#! 6u7n 8 cc$.p d.i
3. Thi : - 9/ thi nghi:! t;c trong hc t+p,
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Gio n vt l 9Trng THCS Tn An
chung *# tri thQc @+t $O n/i ri:ng cI&hc sinh PZ / c/ ci nhn < Ihn *U th gi.i tF nhi:nN- JS= [gh7, nh. $i *&i tr\ cI& *+t $O'ho& hc trong Xi s"ng h#ng ng#
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Gio n vt l 9Trng THCS Tn An
PJ9S cI& h&n Jo#ng @1nNl Sch nng c&o= tut *#i 7! $:n (ng trnh #?%0 ") "3* - &/ ;%V- F- hng php thFc nghi%!- hng php nghi:n sF ph)thuc cI& !t i $ng *+t $O *#occ
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Gio n vt l 9Trng THCS Tn AnDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDGing: 9A:..9B:..
T it 2:CHNG I4 6IN HC(
S PH THUC C7A CQNG 6 DRNG 6INVO HIU 6IN TH GIA HAI 6U DW DN(
I(MX* -c !ch i%n th7o s 3 -S2 d)ng cc d)ng c) o= @n ', &!p7' -S2 d)ng !t s" thu+t ngW 'hi n/i *U hi%u i%n th *# cXng d\ng i%n -K0 n1ng * *# s2 $ 3 thH ). T"i 67: -:u thch !n hc
II( C"#$% &'4 1. Gio vin: B(ng ph) ghi ni dung (ng Ltr-SGKN, (ng Mtr-SGKN
B(ng L= K6 o
n o
Ji%u i%nth@N
9Xng d\ng
i%n?N
L _ _M M,^ _,L] , _,M b,L _,Mb
L_,b _,]b
B(ng M= K6 o
n o
Ji%u i%nth@N
9Xng d\ng
i%n?NL M,_ _,LM M,] _,M _,M
a,_
( Bng 1: Gio i!n "#m th$ nghim tr%c & 'hng th)c h#nh-*o +nh %i ,t./ "#m c hc +inh2. 8i n"% " !in" =->t d< dn Rng nicr! chiUu d#i Lb__!!, Xng 'nh _,]!!, d< n#Z @Z ">?%0 )% -"J %0"
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Gio n vt l 9Trng THCS Tn Ancho 't 6u( s&u
-G@ gi i i%n nh/! c 't 6u(th nghi%!, G@ ghi $:n (ng ph)-Gi cc nh/! 'hc tr( $Xi cu 9L tZ't 6u( th nghi%! cI& nh/!
-G@ nh gi 't 6u( th nghi%! cI&cc nh/! :u cu JS ghi cu tr( $Xi9L *#o *8
l~< = PZ 'ho K tr8 *U cFc dngcI& ngu3nl~< , d< a= PZ cc n;! -N, lNcI& *n ' !c *#o h&i u on d Tt ' tr:n 3 thH t& $#!nh s&u=lK Xng thng song song *.i tr)cho#nh, ct tr)c tung ti iE! c/cXng ` tng QnglK Xng thng song song *.i tr)ctung, ct tr)c ho#nh ti iE! c/ hi%ui%n th y tng Qng9= K6 o
n o
Ji%u i%nth @N
9Xng d\ng i%n
?NL M _,LM M, _,LM] _,M
= J~@[= lJc thuc phn ghi nh. lc th:! !)c 9/ thE 7! ch& it lJc #i *# $#! #i t+p L SBP.: /0t kinh n(hi1m (i 3%4:5555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555
55555555555555555555555555555555Ging: 9A:..9B:..T it 3:
6IN Thi C7A DW DN!6jNH LUT M(
?>9 P`y=LKin thQc=
-[h+n it c n *H i%n tr8 *# *+n d)ng c cng thQc tnh i%n tr8 E
gi(i #i t+p-ht iEu *# *it c h% thQc cI& Hnh $u+t A!-@+n d)ng c Hnh $u+t A! E gi(i !t s" dng #i t+p n gi(n
MK0 n1ng =
GV:Trn Vit Cng Nm hc :2012 - 20137
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Gio n vt l 9Trng THCS Tn An-S2 d)ng !t s" thu+t ngW 'hi n/i *U hi%u i%n th *# cXng d\ng i%n-@ s 3 !ch i%n s2 d)ng cc d)ng c) o E c Hnh i%n tr8 cI& !td< dn ] Phi =-9n th+n, 'i:n tr trong hc t+p B9Jy[ B 9? G`} @`[ @ J9 S`[J
G@= K szn (ng ghi gi trH thng s"8
9
9J{|[G J} = -~F& *#o 't 6u( s" $i%u trong (ng L *# M 8 #i L,
JS tnh thng s"8
9[h+n qt
-Phu th+p thng tin= ~F& *#o s" $i%u thu c tZ P[ 8 #i tr.c ~ P 9J9 JP [G ~ J9 L= Kim tra :KiE! tr& #i c=
L [:u 't $u+n *U !"i 6u&n h% giW&hi%u i%n th giW& h&i u d< dn *#cXng d\ng i%n ch< 6u& d:g&! L>L___ ___- ngh0& cI& i%n tr8= BiEu thH !Qc c(n tr8 d\ng i%n nhiUu h&< t cI&
d< dnH$%t &-n(2 :J}P B`y @ @`P B`y PJ9 [J yP A>
-G@ h.ng dn JS tZ cng thQc8 8
D 99 D
= = *# thng o < chnh
$# iEu thQc cI& Hnh $u+t A! :ucu dF& *#o iEu thQc Hnh $u+t A!
h5< pht iEu Hnh $u+t A!
`` Hnh $u+t A! L J% thQc cI& Hnh $u+t
89
D=
trong ?E: 8 ?o ;Fng n (V> 9 ?o ;Fng m'H (> D ?o ;Fng m (I
M ht iEu Hnh $u+t Cng ?J Kng ?in chL< ./ KM t( c cch " tr P[ 'iE! tr& $i cc h% thQc su< r& tZ $ thu
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Gio n vt l 9Trng THCS Tn An
-K0 n1ng thFc h#nh s2 d)ng cc d)ng c) o i%n= *n ', &!p7 '-K0 n1ng " tr, tin h#nh $p rp P[-K0 n1ng su< $u+n] Phi =-@+n d)ng 'in thQc 5 hc E gi(i thch !t s" hi%n tng n gi(n c/ $i:n 6u&n trong
thFc t-:u thch !n hc B 9Jy[ B ~[G= "i *.i !Vi nh/! JS=-] i%n tr8 !u= wLL wML_ w]a-L &!p7 ' c/ GJ L? -L *n' c/ GJ a@-L cng tc -L ngu3n i%n a@ -9c on d< n"i 9J{|[G J}= Phng 6u& #i t+p, !8 rng cho on !ch g3! ] i%n tr8 !c
song song *# c/ trH s" i%n tr8 Rng nh&u *# Rng wLth L
]
tK
DD =
~P 9J9 JP [G ~ J9). Kim tra:
-Prong on !ch g3! M /ng n !c song song, hi%u i%n th *#cXng d\ng i%n cI& on !ch c/ 6u&n h% th n#o *.i hi%ui%n th *# cXng d\ng i%n cc !ch r@= "i *.i on !ch !c n"i tip, ch;ng t& 5 it wtRng
tYng cc i%n tr8 th#nh phn @.i on !ch song song i%n tr8tng ng cI& on !ch c/ Rng tYng cc i%n tr8 th#nh phn'hngB#i !.i
LM=yyLyM``Ll`M
2.Dy hc bi mi
H$%t &'n( )= [J[ B`P [ >9J G> J? `[ Pw >9 S[GS[G
-:u cu JS 6u&n st s 3 !ch i%n hnhL *# cho it i%n tr8 wL*# wMc !c*.i nh&u nh th n#o [:u *&i tr\ cI& *n', &!p7 ' trong s 3-G@ thng o cc h% thQc *U !"i 6u&n h%giW& y, trong on !ch c/ h&i /ng nsong song *n ;ng cho trXng hp M i%ntr8 wLwM@it h% thQc *.i h&i i%n tr8wLwM-J.ng dn JS th(o $u+n 9M-9/ thE & r& nhiUu cch chQng!inhG@ nh+n qt Y sung
9Xng d\ng i%n *# hi%u i%n thtrong on !ch song song-Jnh L= wLwM?N nt wLwMN?N o cXng d\ngi%n !ch chnh @N o JP giW& h&iiE! ?, B cng chnh $# JP giW& h&i uwL*# wMy?ByLyM LN`?B`Ll`M MN9M= P/! tt= wLwM
9!=L M
M L
9 D
9 D=
GV:Trn Vit Cng Nm hc :2012 - 201315
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Gio n vt l 9Trng THCS Tn An
-PZ iEu thQc ]N, h5< pht iEu th#nh $Xi
!"i 6u&n h% giW& cXng d\ng i%n 6u&cc !ch r *# i%n tr8 th#nh phn
Gi(i= }p d)ng iEu thQc Hnh $u+t A! cho!Vi on !ch nhnh, t& c/=
L
L L L M
MM M L
M
8
9 D 8 D
89 8 D
D
= = @ wLwMn:n yLyM
L M
M L
9 D
9 D= ]N Prong on !ch song song
cXng d\ng i%n 6u& cc !ch r t $%nghHch *.i i%n tr8 th#nh phn
H$%t &'n(2= ~[G 9A[G PJ9 P[J `[ Pw P{|[G {|[G 9?[ >9J G> J? `[ Pw >9 S[G S[G
-:u cu c nhn JS ho#n th#nh cu 9]
-Gi L JS $:n (ng trnh #
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Gio n vt l 9Trng THCS Tn An
-:u cu JS pht iEu th#nh $Xi !"i 6u&nh% giW& y, , w trong on !ch song song-:u cu JS th(o $u+n nh/! nhm tr( $Xi cu9-:u cu c nhn ho#n th#nh cu 9
-G@ !8 rng=
lProng on !ch c/ ] i%n tr8 !c songsong th i%n tr8 tng ng=
L M ]
L L L L
tKD D D D
= + +
9= l@ 6ut trn *# n d< t/c c/ c4ngJP Hnh !Qc $# MM_@n *# 6ut
c !c song song *#o ngu3n MM_@ Ech;ng hot ng nh thXnglS 3 !ch i%n=
l[u n 'hng hot ng th 6ut *nhot ng *# 6ut *n c !c *#o JP
5 cho ch;ng hot ng c $+p nh&uN3. !"# c$9= l@ wLwMdo / i%n tr8 tng ng wLM$#=
LM
LM L M
L L L L L LLi
]_ ]_ LiD
D D D= + = + = =
lKhi !c th:! i%n tr8 w]th i%n tr8 tng ng w?9cI& on !ch !.i $#=
LM ]
L L L L L ] LL_
Li ]_ ]_ L_ C
C
DD D D
= + = + = = =
w?9nhm hn !Vi i%n tr8 th#nh ph
%( H&"# '(" )* "h4 -#! #i t+p SBPN -An $i 'in thQc #i M, , .: /0t kinh n(hi1m (i 3%4:555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555
Ging: 9A:..9B:..
Tit7 BI TP VN DNG 6jNH LUT M(
?>9 P`y=
L Kin thQc= - @+n d)ng cc 'in thQc 5 hc E gi(i c cc #i t+p n
gi(n *U on !ch g3! nhiUu nhTt $# ] i%n tr8
GV:Trn Vit Cng Nm hc :2012 - 201317
>
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Gio n vt l 9Trng THCS Tn An
M K0 n1ng= -Gi(i #i t+p *+t $ th7o ;ng cc .c gi(i -wn '0 n1ng phn tch, so snh, tYng hp thng tin -S2 d)ng ;ng cc thu+t ngW ] Phi = -9n th+n, trung thFc B ~[G ~ J9 B(ng ph)
9J{|[G J}=9c .c gi(i #i t+p=
-B.c L= P! hiEu t/! tt U #i, * s 3 !ch i%n nu c/N -B.c M= hn tch !ch i%n, t! cng thQc $i:n 6u&n n cc i $ng
-B.c ]= @+n d)ng cng thQc 5 hc E gi(i #i ton -B.c = KiE! tr& 't 6u(, tr( $Xi
~ P 9J9 JP [G ~ J99(Kim-@Z4
K`> Pw? B` 9-P 9J9 P[J Jy[G J9 P
-ht iEu *# *it iEu thQc Hnh $u+t A!-@it cng thQc iEu dixn !"i 6u&n h%giW& y, `, w trong on !ch c/ M i%n
tr8 !c n"i tip, song song@=Pr7o (ng ph) cc .c chung E gi(i #i t+p i%n
2.Dy hc bi mi:
H$%t &'n( )= G`` B` P L
-Gi L JS c U #i #i L-Gi L JS t/! tt U #i-:u cu c nhn JS gi(i #i t+p L r&nhp-J.ng dn=l9ho it wL*# wMc !c *.i nh&unh th n#o ?!p7 ', *n 'o nhWngi $ng n#o trong !ch i%n
l@+n d)ng cng thQc n#o E tnh i%n tr8tng ng wtd*# wM Ph&< s" tnhwtdwM
P/! tt= wL
y*
a@ `?
_,?&Nwtd wMB#i gi(i=hn tch !ch i%n= wLnt wM
?Nnt wLnt wM `?`?B_,?y*y?Ba@
&Na
LM_,i
BtK
B
8 VD
9 = = =
i%n tr8 tng ng cI& on !ch ?B$# LMN @ wLnt wMwtdwLlwMwMwtd - wLLM-^
GV:Trn Vit Cng Nm hc :2012 - 20131
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Gio n vt l 9Trng THCS Tn An
-:u cu JS n:u cch gi(i 'hc, chnghn= Pnh yLs&u / tnh yMwM*# tnhwtdwLlwM
@+< i%n tr8 wMRng ^
H$%t &'n( 2= G`` B` P M=
-Gi L JS c U #i #i M-:u cu c nhn gi(i #i M th7o ;ng cc
.c gi(i-S&u 'hi JS $#! #i ong, G@ thu !t s"
#i cI& JS E 'iE! tr&-Gi L JS $:n chW& phn &N L JS chW&
phn N-Gi JS 'hc n:u nh+n qt [:u cc cch
gi(i 'hc * d)= @L M
L M
M L
9 D
D D9 D
=
9ch tnh wM*.i wL `L5 it `M` - `LJokc i tnh w?B=
L M M L
M
M
LM M_
L,b ]
L L L L L L
L ] L LM_
M_ L_ M_
BB
B
B B
8 VD
9
D D D D D D
DD
= = =
= + =
= = =
S&u 'hi it wMcng c/ thE tnhy?B`w?B-Gi JS so snh cch tnh wM
P/! tt=wLL_ `?LL,M? `?L,b?
&N y?B NwMB#i gi(i=
&N ?Nnt wL L`?LL,M??N nt wL wMN `?`?BL,b?
PZ cng thQc=L L L
L M L M
L,ML_ LMK N
LMB
89 8 9 D 8 9 D V
D
D D 8 8 8 V
= = = = =
= = =
Ji%u i%n th giW& h&i iE! ?B $# LM@N @ wLwMn:n ``Ll`M`M`-
`LL,b?-L,M?_,a?M
M
M
LMM_
_,a
8 VD
D = = =
@+< i%n tr8 wMRng M_
H$%t &'n( = G`` B` P ]=
-Png tF h.ng dn JS gi(i #i t+p ]-G@ chW& #i *# u& r& iEu iE! chT!cho tZng cu :u cu JS Yi #i chonh&u E chT! iE! cho cc n trongnh/!-u O cc cch tnh 'hc nh&u, nu ;ng
*n cho iE! t"i &
P/! tt= L iE!NwLL wMw]]_ y?BLM@&Nw?B N`L, `M, `]B#i gi(i=
&N ?Nnt wLnt wMw]N L iE!N@ wMw]wM,]]_=MLN L iE!N
9/ thE tnh 'hc 't 6u( ;ng cng cho LiE!Nw?BwLlwM,]LlL]_ LiE!N
GV:Trn Vit Cng Nm hc :2012 - 20131S
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Gio n vt l 9Trng THCS Tn An
i%n tr8 cI& on !ch ?B $# ]_ _,iE!N
N }p d)ng cng thQc Hnh $u+t A!
L
LM_,c
]_
_,c
BB
B
B
88 V9 9
D D
9 9
= = = =
= =
L,iE!N
L L L _, cLi a8 9 D V = = = L iE!NM ] L LM a aB8 8 8 8 V V V = = = = _,iE!N
MM
M
a_,MK N
]_
89
D= = = L iE!N
M ] _,M9 9 = = _,iE!N@+< cXng d\ng i%n 6u& wL$# _,?9Xng d\ng i%n 6u& wM w]Rng
nh&u *# Rng _,M? L iE!Nv
( C]%0 *4B#i L= *+n d)ng *.i on !ch g3! M i%n tr8 !c n"i tipB#i M= *+n d)ng *.i on !ch g3! M i%n tr8 !c song songB#i ]= *+n d)ng cho on !ch hVn hp u O cch tnh i%n tr8 tng ng *.i!ch hVn hp
k. +"# '(" )* "h:
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Gio n vt l 9Trng THCS Tn An
] Phi = Prung thFc, c/ tinh thn hp tc trong hot ng nh/! B ~[G ~ J9"i *.i !Vi nh/! JS=- L ngu3n i%n V v" )cng tc -L &!p7 ' c/ GJ $# L?- L *n ' c/ GJ $# a@ -] i%n tr8= SLSMS]c4ng $oi *+t $i%u- $LC__!! $MLb__!! $]M^__!! - 9c i%n tr8 c/ _,]!! 9J{|[G J}= Phu th+p thng tin dF on su< $u+n dixn dHch tZ trXnghp chung cho !t trXng hp ri:ng KiE! tr& Rng thFc nghi%! Khng Hnh tnh;ng n ~P 9J9 JP [G ~ J9.Kim tra:
-JSL= 9hW& #i t+p aM phn &N SBPN
JS c/ thE 'hng cn tnh c) thE nhng gi(ithch ;ng E i n cch !c iE!N@ s 3 ;ng iE!N-JSM=L Prong on !ch g3! M i%n tr8 !cn"itip cXng d\ng i%n ch< 6u& !Vi i%ntr8 c/ !"i 6u&n h% nh th n#o *.i cXng d\ng i%n !ch chnh
Ji%u i%n th giW& h&i u on !ch $i:nh% nh th n#o *.i !Vi i%n tr8 th#nh phnM@ s 3 !ch i%n s2 d)ng *n ' *#&!p7 ' E o i%n tr8 cI& !t d< dn-G@ nh gi cho iE! M JS@= 9h;ng t& it *.i !Vi d< dn th w $#'hng Yi @+< i%n tr8 !Vi d< dn ph)thuc nh th n#o *#o (n thn d< dn /B#i !.i
B#i aM phn &N
&N @ M cch !c Uu c !c *#oc4ng !t hi%u i%n th ya@
9L= i%n tr8 tng ng cI& on !ch $#=
td L
L
aw Li
_,ctK
8 VD
9 = = =
9M= i%n tr8 tng ng cI& on !ch $#
M M
M
L M
a L_
L,b ]tK tK
tK tK
8 VD D
9
D D
= = =
>
9ch L= wLnt wM 9ch M= wLwM
L M L M
L M
L M
D ntD 9 9 9
8 8 8
D D D
= =
= +
= +
-@ ;ng s 3 !ch i%n, ch r ch"t n"i*n ', &!p7 ' iE!N
2.Dy hc bi mi:H$%t &'n(): P> J`y `[ Pw ~ ~[ J PJy9 @ [J[G y
P [
-:u cu JS 6u&n st cc on d< dn 8hnh L cho it ch;ng 'hc nh&u 8
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Gio n vt l 9Trng THCS Tn An
cI& d< dn-:u cu th(o $u+n nh/! U r& phng n'iE! tr& sF ph) thuc cI& i%n tr8 d< dn*#o chiUu d#i d< dn-:u cu & r& phng n P[ tYng 6ut Ec/ thE 'iE! tr& sF ph) thuc cI& i%n tr8 *#oL trong ] c !ch i%n th7o s 3 hnhM&:u cu cc nh/! chn d)ng c) P[,
tin h#nh P[ th7o nh/!, ghi 't 6u( *#o(ng L #! P[ tng tF th7o s 3 hnh^M ^Mc-G@ thu 't 6u( P[ cI& cc nh/! Gicc n nh/! 'hc nh+n qt
-:u cu n:u 't $u+n 6u& P[ 'iE! tr& dFon-G@= @.i M d< dn c/ i%n tr8 tng QngwL, wMc/ c4ng tit di%n *# c $#! tZ c4ng!t $oi *+t $i%u , chiUu d#i d< tng Qng $#
$L, $Mth=L L
M M
D "
D "=
` SF sF phuc cI& i%n tr8 *#o chiUu d#id< dnL~F 'in cch $#!
M Ph nghi%! 'iE! tr&
] Kt $u+n=
i%n tr8 cI& cc d< dn c/ c4ng tit di%n *#c $#! tZ c4ng !t $oi *+t $i%u th t $%
thu+n *.i chiUu d#i cI& !Vi d
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Gio n vt l 9Trng THCS Tn An
L LL M
M M
cD "
" "D "
= =
k( H>%0 1b% cr %"E-Jc #i *# $#! #i t+p SBP ,: t /i"h "#hi0m #i1 'y:
55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555
Ging: 9A:..9B:..
Tit9: S PH THUC C7A 6IN Thi VO TIT DIN DW DN( `>9 P`y=L Kin thQc=-Su< $u+n c rRng cc d< dn c/ c4ng chiUu d#i *# $#! tZ c4ng !t $oi *+t $i%u th i%ntr8 cI& ch;ng t $% nghHch *.i tit di%n cI& d Pw? B 9-P 9J9 P[J Jy[G J9 P
L Prong on !ch g3! M i%n tr8 !csong song, JP *# cXng d\ng i%n cI&
on !ch c/ 6u&n h% th n#o *.i JP *#cXng d\ng i%n cI& cc !ch r @itcng thQc tnh i%n tr8 tng ng cI&on !ch /
L T@+%0 .+% ;*" 0f;
L M
L M
L M
LM L M
nn =
L L L
D D
9 9 9
8 8 8
D D D
= +
= =
= +
GV:Trn Vit Cng Nm hc :2012 - 201323
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Gio n vt l 9Trng THCS Tn AnM >u"n c Hnh !"i 6u&n h% giW& i%n tr8*#o chiUu d#i d< dn th ph(i o i%n tr8cI& d< dn nh th n#o
] @ s 3 !ch i%n 'iE! tr& sF ph)thuc cI& i%n tr8 d< dn *#o chiUu d#id K`> Pw? ~ }[
-@ s 3 !ch i%n 'iE! tr&[:u d)ngc) cn thit E $#! P[, cc .c tin h#nhP[-:u cu JS $#! P[ 'iE! tr& th7o nh/!
E ho#n th#nh (ng L-trM]-G@ thu 't 6u( P[ cI& ccnh/!J.ng dn th(o $u+n chung c( $.p-:u cu so snh *.i dF on E r;t r& 't$u+n-:u cu JS c
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Gio n vt l 9Trng THCS Tn An
P s"=
M
MM
M M
M M
LL L
c
c
K
* K
K* K
= =
w;t r& 't 6u(=
M
L M M
M
M L L
D * K
D * K= =
Kd- F#%= i%n tr8 cI& cc d< dn c/ c4ngchiUu d#i *# c $#! tZ c4ng !t $oi *+t$i%u th t $% nghHch *.i tit di%n cI& d
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Gio n vt l 9Trng THCS Tn An
-@+n d)ng cng thQc"
D*
= E tnh c !t i $ng 'hi it cc i
$ng c\n $iMK0 n1ng=->c !ch i%n *# s2 d)ng d)ng c) o E o i%n tr8 cI& d< dn-S2 d)ng (ng i%n tr8 suTt cI& !t s" chTt
] Phi = Prung thFc, c/ tinh thn hp tc trong hot ng nh/! `` ~[G ~ J9
"i *.i !Vi nh/! JS= J&i d< dn 'hc nh&u c/L M
L M
_]
Lb__
mm
" " mm
= == =
~< L= 9onst&nt&n, d< M= [icro!, L ngu3n i%n @, L cng tc L &!p7 ' c/ GJ $# L? *# 9[[ $# __L? L *n' c/ GJ $# a@ *# 9[[ $# _L@ 9c on d< n"i vJ{|[G J}= Phu th+p thng tin dF on su< $u+n dixn dHch
tZ trXng hp chung cho !t trXng hp ri:ng 'iE! tr& Rng thFc nghi%! 'hng Hnh tnh ;ng n-G@ thng o 'hi ni%! i%n tr8 suTt
-JS tF $Fc su< $u+n th7o cc .c 5 c Hnh h.ng ~9P= "
D*
=
``` P 9J9 JP [G ~ J9L: Kim tra s s: C? D CBDD2: Kim tra:-eu& tit ^, b t& 5 it i%n tr8 cI& !t d< dn ph) thuc *#o cc
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Gio n vt l 9Trng THCS Tn An
Gi i di%n cc nh/! n:unh+n qt r;t r& tZ 't 6u(P[
MKt $u+n= i%n tr8 cI& d< dn ph) thuc*#o *+t $i%u $#! d< dn
vJ M= P> J`y @ `[ Pw SyP
-:u cu JS c !)c L *# tr( $Xicu hmi=li%n tr8 suTt cI& !t *+t $i%uh&< L chTtN $# glK hi%u cI& i%n tr8 suTtln *H i%n tr8 suTt-G@ tr7o (ng i%n tr8 suTt cI& !ts" chTt 8 M__9 Gi JS tr& (ng Ec Hnh i%n tr8 suTt cI& !t s"chTt *# gi(i thch O ngh0& con s"-:u cu c nhn ho#n th#nh 9M
`` i%n tr8 suTt-9ng thQc i%n tr8
Li%n tr8 suTt-i%n tr8 suTt cI& !t *+t $i%u h&
Rng *+t $i%u / c/ chiUu d#i L! *#c/ tit di%n $# L!Mi%n tr8 suTt c ' hi%u $# n *H i%n tr8 suTt $# !
GV:Trn Vit Cng Nm hc :2012 - 2013
9c.ctnh
~< dn c/ cc i%n tr8 suTt 'hc nh&u
N
i%n tr8du"n in tr8 con ch< c/ tc d)ng$#! th&< Yi i%n tr8 ph(i !c n/*#o !ch i%n 6u& cc ch"t n#o-G* gi JS nh+n qt, Y ung [uJS 'hng n:u c I cch !c,G@ Y sung-G* gi.i thi%u cc ' hi%u cI& intr8 tr:n s 3 !ch i%n, JS ghi *8-Gi JS tr( $Xi 99hu
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Gio n vt l 9Trng THCS Tn Annhn JS ho#nth#nh cu 9C-:u cu JS$#! #i L_M trL-SBPN
B#i L_MP/! tt=Bin tr8 M_-M,?N aL,LL_ m = $_!
&NGi(i thch O ngh0& con s"&N y!&S
B#i gi(i=&N ngh0& cI& con s"= _ $# i%n tr8 $.n nhTt cI&
in tr8 M,? $# cXng d\ng i%n $.n nhTt !#in tr8 chHu c
N Ji%u i%n th $.n nhTt c phqp kt $:n h&i u d99? 9}9 ~[G 9 `[
-G@ cho JS 6u&n st !t s" d)ng c)i%n Gi JS c s" c ghi tr:ncc d)ng c) /G@ ghi (ng L s"* d)-:u cu JS c s" ghi tr:n M /ngn P[ &n u Pr( $Xi cu hmi9L
-G@ th2 $i sng cI& h&i n EchQng !inh *.i c4ng JP, nL__ sng hn n M-G@= $.p ^ t& 5 it s" *n @N c/
;.Ct 6?n" %3 -& /@ng@ 6inL S" *n *# s" ot tr:n cc d)ng c)i%n9L= @.i c4ng !t JP, n c/ s"ot $.n hn th sng !nh hn, nc/ s" ot nhm hn th sng
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Gio n vt l 9Trng THCS Tn AnO ngh0& nh th n#o $.p b ot N$# n *H cI& i $ng n#o S"ot ghi tr:n d)ng c) d4ng i%n c/ Ongh0& g-:u cu JS c thng o !)c M *#ghi O ngh0& s" ot *#o *8-:u cu L, M JS gi(i thch O ngh0&con s" tr:n cc d)ng c) i%n 8 phnL-J.ng dn JS tr( $Xi cu 9]Jnh th#nh !"i 6u&n h% giW& !Qc hot ng !nh,
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Gio n vt l 9Trng THCS Tn AnTit 1,:
6IN NNG!CNG C7A DRNG 6IN(
`>9 P`y= L Kin thQc= -[:u c * d) chQng tm d\ng i%n c/ n1ng $ng-[:u c d)ng c) o i%n n1ng ti:u th) $# cng t i%n *# !Vi s" ! cI&cng t $# L Kh-9h r& c sF chu
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Gio n vt l 9Trng THCS Tn Angi(n *# ng c nhi%tN *+n d)ng*.i hi%u suTt s2 d)ng i%n n1ng
vJ ]= P> J`y 9A[G 9? ~[G `[, 9A[G PJ9 P[J @~[G 9 9A[G 9? ~[G `[
-G@ thng o *U cng cI& d\ngi%n-Gi JS tr( $Xi cu 9-Gi JS $:n (ng trnh #< cu9J.ng dn th(o $u+n chung c($.p-G@= 9ng thQc tnh ?=t p d)ngcho !i c cTu sinh cng ?y`ttnh cng cI& d\ng i%n-Gi JS n:u n *H cI& tZng i$ng trong cng thQc
-G@ gi.i thi%u n *H o cng cI&d\ng i%n 'h, h.ng dn JS cchYi tZ 'h r& f-Prong thFc t E o cng cI& d\ngi%n t& d4ng d)ng c) o n#o-J5< t! hiEu 7! !t s" ! cI&cng t Qng *.i $ng i%n n1ng s2d)ng $# &o nhi:u
`` 9ng cI& d\ng i%nL9ng cI& d\ng i%n9ng cI& d\ng i%n s(n r& trong !t!ch i%n $# s" o i%n n1ng !#on !ch / ti:u th) E chu
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Gio n vt l 9Trng THCS Tn An555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555
Ging: 9A:..9B:..
T9 P`y=
LKin thQc= Gi(i c c #i t+p tnh cng suTt i%n *# i%n n1ng ti:u th)"i *.i cc d)ng c) i%n !c n"i tip *# !c song songM K0 n1ng= -hn tch, tYng hp 'in thQc-K0 n1ng gi(i #i t+p Hnh $ng] Phi = 9n th+n, trung thFc `` J{|[G J}= hng php d< hc chung *.i tit #i t+pB.c L= P! hiEu, t/! tt U #i, * s 3 !ch i%n nu c/NB.c M= hn tch !ch i%n, t! cng thQc c/ $i:n 6u&n n cc i $ngcn t!B.c ]= @+n d)ng cc cng thQc 5 hc E gi(i #i tonB.c = KiE! tr&, i%n $u+n 't 6u( ``` P 9J9 JP [G ~ J9
L: Kim tra s s: C? D CBDD2: Kim tra:-Gi M JS $:n (ng *it cng thQc tnh cng suTt i%n *# i%n n1ng ti:u th)-@+n d)ng *#o *i%c gi(i !t s" #i t+p p d)ng cho on !ch n"i tip, songsong:!"i m#i:
vJ L= G`` B` P L-Gi L JS c U #i #i L,L JS $:n (ng t/! tt U
#i, n *H-:u cu JS tF $Fc gi(i ccphn cI& #i t+p-G@ $u O cch s2 d)ng n*H trong cc cng thQc tnh=LfLsL'h],aL_af@+< c/ thE tnh ? r& n *H
s&u / Yi r& 'h Rng
cch chi& cho ],aL_a
hokctnh ? r& 'h th trongcng thQc ?=t n *H ='N thN
P/! tt=yMM_@ `]L!?_,]L? th]_
&Nw=
N &fNs"NB#i gi(i=
&Ni%n tr8 cI& n $#=MM_
aci_,]Lc
8 VD
9 = =
}p d)ng cng thQc==y`MM_@_,]L?^@+< cng suTt cI& /ng n $# ^
N?=t^]_]a__s]M_ba_f?]M_ba_=],aL_ aC'hC s"hokc ?=t_,_^]_'hC'hCs"
@+< i%n n1ng ti:u th) cI& /ngn trong !t thng $# C s"
GV:Trn Vit Cng Nm hc :2012 - 20133
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Gio n vt l 9Trng THCS Tn An
vJ M= G`` B` M=-G@
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Gio n vt l 9Trng THCS Tn An
M
8
tD
=
9ch gi(i p d)ng cng thQc?=t $# gn nhTt *# 'hng !cs&i s"eu& #i ]=l9ng thQc tnh ?, =l9ng suTt ti:u th) cI& c( on!ch Rng tYng cng suTt ti:u t)cI& cc d)ng c) ti:u th) i%n c/trong on !chl9ch Yi n *H i%n n1ng tZn *H f r& 'h
i%n tr8 tng ng cI& on !ch $#
N@ n !c song song *.i #n $# *#oJP MM_@ Rng JP Hnh !Qc do /cng suTt ti:u th) cI& n *# #n $# Uu
Rng cng suTt Hnh !Qc ghi tr:n n *##n $# 9ong suTt ti:u th) i%n cI& on!ch $#===l=BL__lL___LL__L,L'?=tLL__]a__s]Ca____f h&