Question

Помогите пожалуйста!

Answer 1

$\frac{x - {y}^{2} }{y - x} = \frac{0.5 - ( - 0.2) ^{2} }{ - 0.2 - 0.5} = \frac{0.5 - 0.04}{ - 0.7} = \frac{0.46}{ - 0.7} = \\ = - \frac{0.46}{0.7} = - \frac{46}{70} = - \frac{23}{35}$
2) а)

$0.15(x - y) = 0.15x - 0.15y$
б)
$2 \times 45m = 90m$
в)

$x ^{2} + (3a) ^{2} = x ^{2} + 9a ^{2}$