Question

дайте ответ срочно
заранее спасибо​

Answer 1

$\displaystyle\bf\\\frac{y}{(y-9)^{2} } -\frac{y}{y^{2} -81} =\frac{y}{(y-9)^{2} } -\frac{y}{(y-9)(y+9)} =\\\\\\=\frac{y\cdot(y+9)-y\cdot(y-9)}{(y-9)^{2} (y+9)} =\frac{y^{2} +9y-y^{2} +9y}{(y-9)^{2} (y+9)} =\frac{18y }{(y-9)(y+9)(y-9)} \\\\\\Otvet:(y-9)(y+9)(y-9)$