1 ) Найдите значение выражения ( 4 целых 1/3 - (2/5

1 ) (4 1/3 - (2/5)^2 + 3 1/3) : 4/75 = ((4 * 3 + 1)/3 - 2/5 * 2/5 + (3 * 3 + 1)/3) * 75/4 = (13/3 - 4/25 + 10/3) * 75/4 = (23/3 - 4/25) * 75/4 = (25 * 23/75 - 3 * 4/75) * 75/4 = (575 - 12)/75 * 75/4 = 563/4;

Ответ: 563/4.

2) (3 1/2 + (2/3)^2) * x + 3/18 = 5/18;

((3 * 2 + 1)/2 + 2/3 * 2/3) * x = 5/18 - 3/18;

(7/2 + 4/9) * x = 2/18;

(9 * 7/18 + 2 * 4/18) * x = 2/18;

(63/18 + 8/18) * x = 2/18;

71/18 * х = 2/18;

х = 2/18 : 71/18 = 2/18 * 18/71 = 2/71;

Ответ: х = 2/71.