Cách làm cho bạn:
a) x.$\frac{21}{25}=\frac{−7}{10} => x=(\frac{−7}{10}:\frac{21}{25})=\frac{−5}{6}$
b) $\frac{−3}{20}x=\frac{5}{12}−\frac{2}{5} => x=\frac{1}{60}/(\frac{−3}{20})=\frac{−1}{9}$
c) $\frac{2}{9}:x=\frac{1}{18}$:0,375 => x=$\frac{2}{9}:\frac{4}{27}=\frac{3}{2}$
d) $(\frac{−11}{12}):2x=\frac{5}{2}+\frac{1}{4}$
$(\frac{−11}{12})$:2x=$\frac{11}{4}$ => 2x=$(\frac{−11}{12}):\frac{11}{4}$nên x=$\frac{−1}{6}$
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