Question

Hallar lá suma de (a-2b)/(15a) + (b-a)/(20b)

Answer 1

$\frac{a-2b}{15a}+\frac{b-a}{20b}$
$\mathrm{Encontrar\:el\:minimo\:comun\:multiplo}:$
$60ab$

$=\frac{\left(a-2b\right)\cdot \:4b}{60ab}+\frac{\left(b-a\right)\cdot \:3a}{60ab}$
$=\frac{4b\left(a-2b\right)+3a\left(b-a\right)}{60ab}$
$=\frac{-3a^2+7ab-8b^2}{60ab}$