Question

СРОЧНО, ПОМОГИТЕ, ПОЖАЛУЙСТА!!!!!
ОЧЕНЬ НУЖНО ​

Answer 1

$1)\frac{1}{y^{2}-x^{2}}+\frac{1}{x^{2}+2xy+y^{2}}=\frac{1}{(y-x)(y+x)}+\frac{1}{(y+x)^{2}}=\frac{y+x+y-x}{(y-x)(y+x)^{2}}=\frac{2y}{(y-x)(y+x)^{2}}\\\\\\2)\frac{4xy}{y^{2}-x^{2}}:\frac{2y}{(y-x)(y+x)^{2}}=\frac{4xy}{y^{2}-x^{2}}*\frac{(y-x)(y+x)^{2}}{2y}=\frac{4xy}{(y-x)(y+x)}*\frac{(y-x)(y+x)^{2}}{2y}=\\\\=2x(y+x)$