Question

(3/7-16/21)*2 1/7+(11/15+0,3):12 2/5

Answer 1

Ответ:

Надеюсь помог‍

Пошаговое объяснение:

(3/7-16/21)*2 1/7+(11/15+0,3):12 2/5

1) 3/7 - 16/21 = (9-16)/21 = -7/21

2) 11/15 + 0,3 = 11/15 + 3/10 = (11*2+3*3)/30 = (22+9)/30 = 31/30

3) -7/21*2 1/7 = -7/21*15/7 = -7*15/21*7 = -1*5/7*1 = -5/7

4) 31/30:12 2/5 = 31/30:62/5 = 31*5/30*62 = 1*1/6*2 = 1/12

5) -5/7+1/12 = (-5*12+1*7)/84 = (-60+7)/84 = -53/84