Question

Срочно!!!!! ПОЖАЛУЙСТА!!!!!

Answer 1

$frac{y^2-6y+9}{y^2-9}: frac{10y-30}{y^2+3y} = frac{(y-3)^2}{(y-3)(y+3)}* frac{y^2+3y}{10y-30} = frac{y-3}{y+3} * frac{y(y+3)}{10(y-3)} = frac{y}{10}= frac{70}{10}=7$