Question

дайте пж сложно мне дайте​

Answer 1

$1)\frac{2}{x-y}-\frac{2}{x+y}=\frac{2(x+y)-2(x-y) }{(x-y)(x+y)}=\frac{2x+2y-2x+2y}{(x-y)(x+y)}=\boxed{\frac{4y}{x^{2}-y^{2}}} \\\\\\2)\frac{2x}{x-4}-\frac{5x-12}{x^{2}-16 }=\frac{2x}{x-4}-\frac{5x-12}{(x-4)(x+4)}=\frac{2x*(x+4)-5x+12}{(x-4)(x+4)}=\frac{2x^{2}+8x-5x+12 }{(x-4)(x+4)} =\\\\=\boxed{\frac{2x^{2}+3x+12 }{x^{2}-16 }} \\\\\\3)\frac{1}{a+b}-\frac{1}{a-b} =\frac{a-b-a-b}{(a+b)(a-b)}=-\frac{2b}{a^{2}-b^{2}}=\boxed{\frac{2b}{b^{2}-a^{2}} }$