Page 63 - aljaber

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B,C ≤ 9 .A < 3

.111A > 192 .11B + C ≤ 99 + 9 = 108

.A ≥ 2

.11B +C = 78 A=2

.C = 1 B = 7

( ) ( ) () :( ) ( )

.1 1 = 1.2 =/ 5 .1.25 = 1 1 = 5

54 44

a a −b :( ) ( )

.b = −16 a = 12 . b

.a − b = 12 − (−16) = 28

:( ) ( )

.(1 + 3 − 4) + (2 + 5 − 6) = 0 + 1 = 1

:( ) ( )

39 = 3 × 13
51 = 3 ×17

77 = 7 × 11

91 = 7 × 13 17

. 51

:( ) ( )

.(2 ∗ 4) ∗ (1 ∗ 3) = 3 ∗ 3 = 4

:( ) ( )

5 − 4 + 6 × 3 = 1 + 18 = 19