Question

Сократить дробь
$frac{(5x+3y)^{2} -(5x-3y) ^{2} }{y}$

Answer 1

$frac{(5x+3y)^2-(5x-3y)^2}{y} = frac{25x^2+30xy+9y^2-25x^2+30xy-9y^2}{y} = frac{60xy}{y} =60x$