Question

Помогите пож с домашкой

Answer 1

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