1122/21/21

  

54

(a  b)(c  d)  ac  ad  bc  bd

an  a  a  a .... a n

(a  b)(a  b)  a2  b2 (a  b)  a  2ab  b 2

2

2

(a  b)  a  2ab  b

2

a  10n ;1  a  10

;n  N

2

2

an  ak  ank an 1 nk  a  ;a  0 ak ak n 1 an  n ;a  0 a

a  b

n

 an  bn

n

an a  b   bn   

  an

k

 ank

;b  0

8 2 = 20

 1  1  3  ___  4     

241 ___ 1610

30

 9

(0.25)30 ___ (0.75)35

11

___  3 

21

21 1 2 ) (x  5)  2x(x  3)

2 ) (2x  3)(2x  3)  (x  2)

) – 2(x – 1)(x + 1)

2 2 ) (3x  2k)

2

21 2

a,b,x  0 (

(2x)4  x3 

( 3b)3  b5  ( 3)7 

x8  (6x)3  62  x 3

‫(هـ‬

b3  (ab)6  a5  (ab)2  (ab)2

3

8 4

a,b  0 2 a  



□

32 a5

4

25 b  2      29 b5 3 b b

8 5 =

55  103

0.1034

4  106

3  1010

4

□ □ □ □

55  103

1.034  102

44  105

30  109

8 6

4a2  28a  ___  (___  ___)2

___  ___  9b4  (2a  ___)2

___  12a  ___  (3a  ___)2

‫(د‬

___  12a2b  4b2  (___  ___)2

5

21 7 x

6

21 8 AIPN

RINA

P  70 AIN  25 R

21 9 DEFG DE = EG =

8

DEG  90

7

21 21

8