O-net

y = f(x)

1. f (x) = 2. f (x) =

3 f (x) 4 f (x)

- V-Shape

( V )

- U-Shape ( U )

f(x) = + 1

f (x) =

2

O-net

1. 1300 2. 1350

3. 1400 4. 1450

k ,3,5,…,49

k , , ,…,

3 ,

9( 57)

9 9

100 10,000 9 108,

117, 126, ..., 9,999

a1 = 108, an = 9,999 117 – 108 = 9

an = a1+ (n – 1)d

9,999 = 108 + (n – 1)9

9,891 = (n – 1)9

1,099 = n – 1

n = 1,100

1,100 9 100

10,000

4

“ONET”

( 57)

4.

“ONET”

5 ( O-NET 2549, 2

3 100

10

310

1. 24 2. 25 3. 26

4. 27

a1 =100

d = +10

n an =100 + (n −1)10

an = 310 310 =100 + (n −1)10 n = 22

a1 3 a22 24

3 + 22 = 25 3 1

1. 21000 < 3600 <10300 2. 3600 < 21000 <10300

3. 3600 <10300 < 21000 4. 10300 < 21000 < 3600

21000 log21000 =1000log2 =1000(0.301) =

301

3600 log3600 = 600log3 = 600(0.48)

300

10300 log10300 = 300log10 = 300(1.00) =

300

3600 <10300 < 21000

U

A

B

3

∴ 4

6

5

x

3

2

A B

∴ =

6 7 12+35 = 47

100

∴ 6

= 0.47

0.47

10. ( O-NET 2549, 2 )

A = { a, b, c } B = { 0, 1 }

B A

1. { (a,1), (b,0), (c,1) } 2. { (0,b), (1,a), (1,c) }

3. { (b,1), (c,0) } 4. { (0,c), (1,b) }

( )

B A

B

A … 1 3

… 2

4

11. ( O-NET 2549, 2 )

A – B = { 2, 4, 6 }, B – A = { 0, 1, 3 }

A ∪ B = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }

A ∩ B

1. { 0, 1, 4, 5, 6, 7 } 2. { 1, 2, 4, 5, 6, 8 }

3. { 0, 1, 3, 5, 7, 8 } 4. { 0, 2, 4, 5, 6, 8 }

( )

A ∩ B = (A ∪ B) – (A – B) – (B – A) …

A ∩ B = { 5, 7, 8 } 3

3