toán khó

H

hocvuima

Ta có : $\frac{-18}{21}$=$\frac{-6}{7}$
Ta cho $a=-6m$ , $b=7m$
\Rightarrow BCNN{$a,b$}=$6.7.m$=$84$
$42.m$=$84$
$m=84:42$
$m=2$
Vậy $\frac{a}{b}$
$\frac{-12}{14}$
 
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