Cách làm cho bạn:
a) $\frac{5}{3}$ + ($\frac{-2}{7}$) - (-1,2) = $\frac{5}{3}$ - $\frac{2}{7}$ + $\frac{6}{5}$ = $\frac{175}{105}$ - $\frac{30}{105}$ + $\frac{126}{105}$ = $\frac{175 - 30 + 126}{105}$ = $\frac{271}{105}$;
b) $\frac{-4}{9}$ + ($\frac{-5}{6}$) - $\frac{17}{4}$ = -$\frac{4}{9}$ - $\frac{5}{6}$ - $\frac{17}{4}$ = -$\frac{16}{36}$ - ($\frac{30}{36}$) - $\frac{153}{36}$ = $\frac{-16 - 30 - 153}{36}$ = $\frac{-199}{36}$.
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