Question

Упростите выражение 2a/a^2-9b^2 - 2/a-3b

Answer 1

$= frac{2a}{(a-3b)(a+3b)}- frac{2}{a-3b}= frac{2a-2(a+3b)}{(a-3b)(a+3b)}= frac{2a-2a-6b}{(a-3b)(a+3b)} = frac{-6b}{a-3b)(a+3b)}$

Answer 2

2a/(a-3b)(a+3b) - 2/(a-3b)=(2a-2a-6b)/(a²-9b²)=-6b/(a²-9b²)=6b/(9b²-a²)