Cách làm cho bạn:
a) 5$\frac{1}{2}$ + (-3) = $\frac{11}{2}$ - $\frac{6}{2}$ = $\frac{5}{2}$;
b) 4$\frac{9}{11}$ + (-2$\frac{1}{11}$) = $\frac{53}{11}$ - $\frac{23}{11}$ = $\frac{30}{11}$;
c) 2$\frac{1}{2}$ + (-6) = $\frac{5}{2}$ - $\frac{12}{2}$ = $\frac{-7}{2}$;
d) ($\frac{-4}{5}$) + $\frac{1}{2}$ = $\frac{-8}{10}$ + $\frac{5}{10}$ = $\frac{-3}{10}$.
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