Question

упростите вырожение плиз

Answer 1

$frac{4y}{y^2-x^2}- frac{2}{y-x} = frac{4y}{(y-x)(y+x)} - frac{2}{y-x} = frac{4y-2x-2y}{(y-x)(y+x)} = frac{2(y-x)}{(y-x)(y+x)} = frac{2}{y+x}$