Tính bằng cách thuận tiện:
a) \(\frac{-5}{7}+\frac{3}{4}+\frac{-1}{5}+\frac{-2}{7}+\frac{1}{4}\)
b) \(\left( \frac{21}{31}+\frac{-16}{7} \right)+\left( \frac{44}{53}+\frac{10}{31} \right)+\frac{9}{53}\)
c) \(\frac{1}{2}+\frac{-2}{3}+\frac{3}{4}+\frac{-4}{5}+\frac{5}{6}+\frac{-6}{7}+\frac{7}{8}+\frac{6}{7}+\frac{-5}{6}+\frac{4}{5}+\frac{-3}{4}+\frac{2}{3}+\frac{-1}{2}\)
d) \(\frac{1}{2}+\frac{-1}{5}+\frac{-5}{7}+\frac{1}{6}+\frac{-3}{35}+\frac{1}{3}+\frac{1}{41}\)
A.a) \(\frac{{ - 1}}{5}\)
b) \(\frac{{ - 1}}{7}\)
c) \(\frac{7}{8}\)
d) \(\frac{1}{{41}}\)
B.a) \(\frac{{ - 2}}{5}\)
b) \(\frac{{ - 2}}{7}\)
c) \(\frac{7}{8}\)
d) \(\frac{1}{{41}}\)
C.a) \(\frac{{ - 1}}{5}\)
b) \(\frac{{ - 2}}{7}\)
c) \(\frac{7}{8}\)
d) \(\frac{1}{{41}}\)
D.a) \(\frac{{ - 1}}{5}\)
b) \(\frac{{ - 2}}{7}\)
c) \(\frac{7}{8}\)
d) \(\frac{1}{{51}}\)
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Hóa Học lớp 12
