Question

Найдите значения выражений

Answer 1

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