Question

помогите пожалуйста!!!

Answer 1

Здравствуй!

1)
$( - 17.8 - x) - (y - 100.4) = \\ = - 17.8 - x - y + 100.4 = \\ = 82.6- x - y$

2)
$(k - 57.4) - (d - 60 \frac{2}{3} ) = \\ \\ = k - 57.4 - d + 60 \frac{2}{3} = \\ \\ = k - d + 60\frac{2}{3} - 57 \frac{4}{10} = \\ \\ = k - d + 60 \frac{20}{30} - 57 \frac{12}{30} = \\ \\ = k - d + 3 \frac{4}{15}$