Cách làm cho bạn:
a) \(\frac{22}{55}=\frac{22 \div 11}{55 \div 11}=\frac{2}{5}\)
b) \(\frac{-63}{81}=\frac{-63 \div 9}{81 \div 9 }=\frac{-7}{9}\)
c) \(\frac{20}{-140}=\frac{20 \div 20}{-140 \div 20}\frac{-1}{7}\)
d) \(\frac{25}{75}=\frac{25 \div 25}{75 \div 25}=\frac{1}{3}\)
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