Question

помогите a/b - a/a-b

Answer 1

Ответ:

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