Question

Найдите значение выражения

Answer 1

Лови ответ, было очень легко

Answer 2

$\frac{0.4x - 2y}{0.3 {x}^{2} - 7.5 {y}^{2} } = \frac{0.4(x - 5y)}{0.3( {x}^{2} - 25 {y}^{2}) } = \\ = \frac{0.4(x - 5y)}{0.3(x - 5y)(x + 5y)} = \frac{0.4}{0.3(x + 5y)} \\ \\ \frac{0.4}{0.3 \times 4} = \frac{0.4}{1.2} = \frac{1}{3}$