Решить (6 7/12−3 17/36) ∙ 1/2 − 4 1/3 : 13/20. - вопрос №7768079671231736124131320 от холера663 16.03.2020 06:59

Question

Математика: Решить (6 7/12−3 17/36) ∙ 1/2 − 4 1/3 : 13/20.

холера663 · Answer

1)6 7/12 - 3 17/36 = 79/12 - 125/36 =(79 × 3 -125 × 1)/36 = 237/36 - 125/36 = 112/36 = 28/9 = 3 1/9
2)3 1/9 × 1/2 = 28/9 × 1/2 = 14/9 = 1 5/9
3)4 1/3 ÷ 13/20 = 13/3 ÷ 13/20 = 13/3 × 20/13 = 20/3 = 6 2/3
4)1 5/9 - 6 2/3 = 14/9 - 20/3 = (14 × 1 - 20 × 3)/9 = 14/9 - 60/9 = - 46/9 =
- 5 1/9
ОТВЕТ : - 5 1/9