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XU LY SO:
1. Hy vit chng trnh lit k tt c cc s t nhin K tha mn ng thi nhng
iu kindi y:
(i) K l s c 5 ch s;
(ii) K l s nguyn t;(iii) K l s thun nghch (k l s thun nghch nu c
xui hay c ngc cc ch sca k ta u nhn c mt s nh nhau. V d s:
30303);
(iv) Biu din ca K h c s B ( B bt k cng l mt s thun nghch. V d
sk=30303 c biu din h c s 8 l 73137 cng l mt s thun nghch;
2. Hy vit chng trnh lit k tt c cc s t nhin K tha mn ng thi nhng
iu kindi y:
(i) K l s c 5 ch s;(ii) K l s nguyn t;(iii) o ngc cc ch s trong
ca K cng l mt s nguyn t;
(iv) Tng cc ch s ca K cng l mt s nguyn t;(v) Mi ch s trong K cng
l nhng s nguyn t.
3. Hy vit chng trnh lit k tt c cc s t nhin K tha mn ng thi nhng
iu kindi y:
(i) K l s c 5 ch s;(ii) K l s nguyn t;(iii) Mi ch s ca K cng l
nhng s nguyn t;(iv) Tng cc ch s ca K l mt s thun nghch hai ch s;(v)
Tch cc ch s ca K l mt s thun nghch ba ch s.
4. Hy vit chng trnh lit k tt c cc s t nhin K tha mn ng thi nhng
iu kindi y:(i) K l s c 5 ch s;(ii) K l s nguyn t;(iii) Mi ch s ca K
cng l cc s nguyn t;(iv) Tng cc ch s ca K l mt s chia ht cho P (P c
nhp t bn phm);(v) Tch cc ch s ca K l mt s chia ht cho Q (Q c nhp t
bn phm);(vi) Cc ch s ca K khng cha s R (c nhp t bn phm).
5. Hy vit chng trnh lit k tt c cc s t nhin K tha mn ng thi nhng
iu kindi y:
(i) K l s c 5, 7 hoc 9 ch s;(ii) K l s thun nghch;(iii) Tng cc
ch s ca K l mt s chia ht cho P (P c nhp t bn phm);(iv) Tch cc ch s
ca K l mt s chia ht cho Q (Q c nhp t bn phm);(v) Cc ch s ca K khng
cha s R (c nhp t bn phm).
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6. S in thoi di ng ca mt hng vin thng c nh s theo qui cch 091N.
XXX.XXX.Trong , N l s t 2 n 9, X l mt s t 0 n 9. Ta nh ngha cc loi
s in thoi sau:
S in thoi loi I (Loi I): L nhng s c su s cui cng ca n to thnh mt
sthun nghch su ch s. V d s: 0913.558855.
S in thoi loi II (Loi II): L nhng s in thoi Loi I c tng su ch s
cuicng l mt s chia ht cho 10 . V d s: 0913.104.401
(1+0+4+4+0+1=10).
S in thoi loi III (Loi III): L nhng s in thoi Loi II c su ch s
cui cngkhng cha bt k mt s 0 no. V d s: 0913. 122.2211.
Hy vit chng trnh thc hin:
Lit k tt c cc s in thoi Loi I khng cha cc s in thoi Loi II. Ghi
li cc sLoi I vo file Loai1.out theo tng dng, mi dng khng qu 8 s in
thoi.
Lit k tt c cc s in thoi Loi II khng cha cc s in thoi Loi III.
Ghi li ccs Loi II vo file Loai2.out theo tng dng, mi dng khng qu 8
s in thoi.
Lit k tt c cc s in thoi Loi III. Ghi li cc s Loi III vo file
Loai3.out theotng dng, mi dng khng qu 8 s in thoi.
