Question

СРОЧНО ДАЮ 20 БАЛОВ!!!

Answer 1

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