Question

Помогите решить уравнения :
1) 4,2:(2,7+y)=6
2) 72:(17,2-X)=8
3) (4,5-X)x5,8=8,7

Answer 1

$4.2 \div (2.7 + y) = 6 \\ 4.2 = 16.2 + 6y \\ - 12 = 6y \\ y = - 2$
$72 \div (17.2 - x) = 8 \\ 9 = 17.2 - x \\ - 8.2 = - x \\ x = 8.2$
$(4.5 - x) \times 5.8 = 8.7 \\ 26.1 - 5.8x = 8.7 \\ 17.4 = 5.8x \\ x = 3$

Answer 2

Решение на фотографии