Cách làm cho bạn:
$2+\frac{2}{3}=\frac{2}{1}+\frac{2}{3}=\frac{3}{3}+\frac{2}{3}=\frac{5}{3}$
$\frac{3}{4}+ 5= \frac{3}{4}+\frac{5}{1}=\frac{3}{4}+\frac{20}{4}=\frac{23}{4}$
$\frac{8}{12}+ 2= \frac{8}{12}+\frac{2}{1}=\frac{8}{12}+\frac{24}{12}=\frac{32}{12}$
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