Question

Найдите значения выражений

Answer 1

$\frac{2 + 2y}{xy} \div \frac{10 + 10y}{ {x}^{2} } = \\ \frac{2(1 + y)}{xy} \times \frac{ {x}^{2} }{10(1 + y)} = \\ \frac{x}{5y} = \frac{17}{5 \times 2} = \frac{17}{10} = 1.7$
$\frac{ {n}^{2} + 3mn }{5m} \times \frac{35m}{3m + n} = \\ \frac{n(n + 3m)}{5m} \times \frac{35m}{(3m + n)} = \\ 7n = 7 \times 1.6 = 11.2$