Đáp án:
a) $\frac{3}{5}$ - $\frac{-7}{10}$ - $\frac{13}{-20}$
= $\frac{3}{5}$ - $\frac{-7}{10}$ - $\frac{-13}{20}$
= $\frac{12}{20}$ - $\frac{-14}{20}$ - $\frac{-13}{20}$
= $\frac{39}{20}$
b) $\frac{3}{4}$ + $\frac{-1}{3}$ - $\frac{5}{18}$
= $\frac{27}{36}$ + $\frac{-12}{36}$ - $\frac{10}{36}$
= $\frac{5}{36}$
c) $\frac{3}{14}$ - $\frac{5}{-8}$ + $\frac{-1}{2}$
= $\frac{3}{14}$ - $\frac{-5}{8}$ + $\frac{-1}{2}$
= $\frac{12}{56}$ - $\frac{-35}{56}$ + $\frac{-28}{56}$
= $\frac{19}{56}$
d) $\frac{1}{2}$ + $\frac{1}{-3}$ + $\frac{1}{4}$ - $\frac{-1}{6}$
= $\frac{1}{2}$ + $\frac{-1}{3}$ + $\frac{1}{4}$ - $\frac{-1}{6}$
= $\frac{6}{12}$ + $\frac{-4}{12}$ + $\frac{3}{12}$ - $\frac{-2}{12}$
= $\frac{7}{12}$
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