Question

a^2-9b^2/ a^2-ab: a^2+3ab/ a-b

Answer 1

$\frac{(a-3b)(a+3b)}{a(a-b)}:\frac{a(a+3b)}{a-b}=\frac{(a-3b)(a+3b)}{a(a-b)}*\frac{a-b}{a(a+3b)}=\frac{a-3b}{a^2}$