Question

SIMPLIFIQUE AO MÁXIMO A EXPRESSÃO A SEGUIR

Answer 1

$\cfrac{a^2 - ab}{3a^2 + 3ab} : \cfrac{7a-7b}{a^2 - b^2} \\\\= \cfrac{a(a-b)}{3a(a+b)} : \cfrac{7(a-b)}{(a+b)(a-b)} \\\\= \cfrac{a-b}{3(a+b)} \cdot \cfrac{(a+b)}7}\\\\= \cfrac{a-b}{21} \\\\= \cfrac{a}{21} - \cfrac{b}{21}$

b)