Решите ! ! (2/15+ 1 7/12)* 30/103- ( 2: 2 1/4)* 9/32 - вопрос №78619742151712301032214932 от belka1006 16.09.2021 00:04

Question

Алгебра: Решите ! ! (2/15+ 1 7/12)* 30/103- ( 2: 2 1/4)* 9/32

belka1006 · Answer

1)2/15 + 1 7/12 = 2/15 + 19/12 =(2 × 4 + 19 × 5)/60 = 8/60 + 95/60 = 103/60 = 1 43/60
2)2 ÷ 2 1/4 = 2 ÷ 9/4 = 2 × 4/9 = 8/9
3)1 43/60 × 30/103 = 103/60 × 30/103 = 1/2
4)8/9 × 9/32 = 1/4=(1 × 2 - 1 × 1)/4 = (2 - 1)/4 = 1/4
ответ: 1/4