*(1 3/7 + 4 5/21 ) ×1 5/7 +8 1/4÷ 2 5/8 =​

Пошаговое объяснение:

(5/7×2 1/3×5/6-1)÷(1-7/8×1 3/5×3/14) = 5/9

1)5/7  ×  2 1/3 = 5/7  ×  7/3 =  5/3 = 1 2/3

2)1 2/3  ×  5/6 = 5/3  ×  5/6 =  25/18 = 1 7/18

3) 1 7/18 - 1 = 7/18

4)7/8  ×  1 3/5 = 7/8  ×  8/5 =  7/5 = 1 2/5

5)1 2/5  ×  3/14 = 7/5  ×  3/14 =  3/10

6)1  -  3/10 =(1 × 10  -  3 × 1)/10 = (10  -  3)/10 =  7/10

7) 7/18 ÷ 7/10 = 7/18  ×  10/7 =  5/9