Page 57 - aljaber

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.a = 200 b = 1200 . a

. 0.426 . b = 1200 = 6 ()

a 200

:( )

0.4 + 0.02 + 0.006 = 4 + 2 + 6
10 100 1000
= 400 + 20 + 6 = 426 = 0.426
1000 1000

:( ) ()

. 2 = 8 = 0.08

25 100

:( ) ( )
)
2 (81 + 99) + (83 + 97) + (85 + 95) + (87 + 93) + (89 + 91)
= 2(180 + 180 + 180 + 180 + 180)

= 10 × 180 = 1800 :( ) (
65 4 32

. 22 × 3 × 5 × 7 = 420 7

.1 <1 1<1 :( ) ()

19 4 7 4

2 1 + 3 1 + 5 1 < 2 1 + 3 1 + 5 1 = 11
7 2 19 4 2 4

2 1 + 3 1 + 5 1 > 2 + 3 1 + 5 = 10 1
7 2 19 2 2

.11 10 1

2