Cách làm cho bạn:
Ta có:
a)$x−\frac{3}{4}=\frac{2}{7}$
=>$x=\frac{2}{7}-\frac{3}{4}$
=>$x= \frac{29}{28}$
b)$-\frac{3}{8}x−0,75=−1\frac{1}{2}$
=> x=2
c) $(0,25−x):\frac{−3}{5}=\frac{−3}{4}$
=>$(0.25−x)=\frac{-9}{20}$
$=>x=−\frac{1}{5}$
d) $\frac{−3}{5}.(4x−1.2)=\frac{−12}{25}$
=> $4x−\frac{6}{5}=\frac{4}{5}$
=> $x=\frac{1}{2}$
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