Question

помогите пожалуйста!!!

Answer 1

Здравствуй!

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

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