Bài tập 1. Tính:
a) $\frac{3}{10} + (\frac{−5}{12})$
b) $(\frac{−3}{8}) − (−\frac{7}{24})$
c) $(−\frac{5}{14})$ + 0,25
d) $(−\frac{7}{8})$ − 1,25
e) $(−\frac{5}{14}). \frac{21}{25}$
f) $\frac{8}{27}:(−\frac{16}{45})$
g) $(1\frac{5}{6}) : (4\frac{1}{8})$
h) 0,38 . $(\frac{−7}{19})$
i) $(\frac{−4}{5}) . (\frac{15}{−8}).1\frac{1}{9}$
Hướng dẫn trả lời:
a) $\frac{3}{10} + (\frac{−5}{12}) = \frac{−7}{60}$
b) $(\frac{−3}{8}) − (−\frac{7}{24}) = −\frac{1}{12}$
c) $(\frac{−5}{14})$ + 0,25 = $\frac{−3}{28}$
d) $(−\frac{7}{8})$ − 1,25 = $\frac{−17}{8}$
e) $(\frac{−5}{14}) . \frac{21}{25}$ = $\frac{−3}{10}$
f) $\frac{8}{27} : (−\frac{16}{45}) = \frac{−5}{6}$
g) $(1\frac{5}{6}) : (4\frac{1}{8}) = \frac{4}{9}$
h) 0,38.$(\frac{−7}{19}) = \frac{-7}{50}$
i) $(\frac{−4}{5}) . (\frac{15}{−8}) . 1\frac{1}{9} = \frac{5}{3}$
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