Question

Помогите №46 ............
.

Answer 1

$( frac{b}{a-b}- frac{b}{a+b})* frac{a^{2}+2ab+b^{2}}{2b^{2} }= frac{ab+b^{2}-ab+b^{2}}{(a-b)(a+b)} * frac{(a+b)^{2} }{2b^{2} } = frac{a+b}{a-b}$

при а= -0,2, b=0.3

$frac{-0.2+0.3}{-0.2-0.3}= frac{0.1}{-0.5}= - frac{1}{5} = -0.2$