toán khó nha

H

hoangtrongminhduc

$\dfrac{2a-5b}{a-3b}=2+\dfrac{b}{a-3b}$
ta có $\dfrac{a-3b}{b}=a/b-3=\dfrac{3}{4}-3=\dfrac{-9}{4}
$=>$\frac{b}{a-3b}=\frac{-4}{9}$
=>$\dfrac{2a-5b}{a-3b}=2+\dfrac{-4}{9}=\dfrac{14}{9}$
 
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