Question

ПОЖАЛУЙСТА ПОМОГИТЕ ДАМ 50 БАЛЛОВ

Answer 1

$1)\frac{b}{a^{2} }+\frac{1}{a} =\boxed{\frac{a+b}{a^{2} }}\\\\\\2)\frac{x^{2}-3xy }{x^{2}-y^{2}}-\frac{y}{x-y}=\frac{x^{2}-3xy }{(x-y)(x+y)}-\frac{y}{x-y} =\frac{x^{2}-3xy-y(x+y) }{(x-y)(x+y)}=\\\\=\frac{x^{2}-3xy-xy-y^{2}}{(x-y)(x+y)}= \boxed{\frac{x^{2}-4xy-y^{2}}{x^{2}-y^{2}}}$