Question

решите$frac{5b}{b-3} - frac{b+6}{2b-6} * frac{90}{ b^{2}+6b }$

Answer 1

$frac{5b}{b - 3} - frac{b + 6}{2(b - 3)} times frac{90}{b times (b + 6)}$
$frac{5b }{b - 3} - frac{1}{b - 3} times frac{45}{b}$
$frac{5b}{b - 3} - frac{45}{(b - 3) times b}$
$frac{5b {}^{2} - 45 }{b times (b - 3)}$
$frac{5 times (b - 3) times (b + 3)}{b times (b - 3)}$
$frac{5(b + 3)}{b}$
$frac{5b + 15}{b}$