Question

Помогите пожалуйста ​

Answer 1

$\frac{y}{(y+10)^{2}} -\frac{y}{y^{2}-100} =\frac{y}{(y+10)^{2}} -\frac{y}{(y-10)(y+10)} =\frac{y(y-10)}{(y-10)(y+10)^{2}} -\frac{y(y+10)}{(y-10)(y+10)^{2}} =\\\\\frac{y^{2}-10y}{(y-10)(y+10)(y+10)} -\frac{y^{2}+10y}{(y-10)(y+10)(y+10)} =\frac{y^{2}-10y-y^{2}-10y}{(y-10)(y+10)(10+y)} =\frac{-20y}{(y+10)(y+10)(y-10)}$

В окошко вставляешь -20

В=(y+10)(y+10(y-10)