Cách làm cho bạn:
$4+\frac{1}{4} = \frac{4}{1}+\frac{1}{4}=\frac{4}{4}+\frac{1}{4}=\frac{5}{4}$
$\frac{7}{6} -1 = \frac{7}{6}-\frac{1}{1}=\frac{7}{6}-\frac{6}{6}=\frac{1}{6}$
$7- \frac{8}{5}= \frac{7}{1}-\frac{8}{5}=\frac{35}{5}-\frac{8}{5}=\frac{27}{5}$
$frac{3}{4}+5= \frac{3}{4}+\frac{5}{1}=\frac{3}{4}+\frac{20}{4}=\frac{23}{4}$
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