Question

Решите плиз. Срочно надо

Answer 1

$1)\frac{x}{x^{2}-y^{2}}:\frac{1}{5x+5y}=\frac{x}{(x-y)(x+y)}*5(x+y)=\frac{5x}{x-y}\\\\2)\frac{a+3}{a+2}*\frac{a^{2}-4}{2a+6}=\frac{a+3}{a+2}*\frac{(a-2)(a+2)}{2(a+3)}=\frac{a-2}{2}$

$3)\frac{3y}{y^{2}+6y+9}:\frac{y}{y+3}=\frac{3y}{(y+3)^{2}}*\frac{y+3}{y}=\frac{3}{y+3}\\\\4)\frac{b}{b-c}*\frac{b^{2}-c^{2}}{2b^{2}}=\frac{b}{b-c}*\frac{(b-c)(b+c)}{2b^{2}}=\frac{b+c}{2b}$