Question

помогите пожалуйста соч​

Answer 1

a)

$\frac{2a-1}{5b} +\frac{a}{b}= \frac{2a-1}{5b} +\frac{5a}{5b} =\frac{2a-1+5a}{5b} =\frac{7a-1}{5b}$

b)

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