Question

Вычислите.
D
11. Вычислите значения выражений.
a)
42 15 4 3 ; 45 28 5
× + b)

8 18 14 7 ;
21 49 27
− × c)

7 39 22 10 ; 10 55 26
+ ×

Answer 1

Пошаговое объяснение:

a)

(42/45) + (15/28) - (4/5) × (3/5) = (14/15) + (135/140) - (12/25) = (14/15) + (27/28) - (12/25) = 3845/4200 - 3150/4200 + 1680/4200 = (3845 - 3150 + 1680) / 4200 = 375 / 4200 = 1/112

b)

(8/21) × (18/49) × (14/27) - (7/21) = (8/21) × (18/49) × (14/27) - (7/21) = (8/63) × (14/27) - (7/21) = (8/63) × (14/27) - (21/63) = (8/63) × (14/27) - (21/63) = (112/1701) - (21/63) = 112/1701 - 399/1701 = -287/1701

c)

(7/10) + (39/55) × (22/26) = (7/10) + (39/55) × (11/13) = (7/10) + (429/7150) = (7/10) + (429/7150) = (357/715) + (429/7150) = (3570/7150) + (429/7150) = 3999/7150