Question

СРОЧНО ДАЮ 20 БАЛОВ!!!

Answer 1

$frac{x}{x+1}cdot (x-frac{1}{x})=frac{x}{x+1}cdot frac{x^2-1}{x}=frac{x}{x+1}cdot frac{(x-1)(x+1)}{x}=x-1=3,5-1=2,5$