Question

C=\(\frac{-1}{2}+\frac{3}{21}+\frac{-2}{6}+\frac{-5}{30}\)

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Answer 1

\(C=\frac{-1}{2}+\frac{3}{21}+\frac{-2}{6}+\frac{-5}{30}\)

\(C=\frac{-1}{2}+\frac{1}{7}+\frac{-1}{3}+\frac{1}{6}\)

\(C=\frac{-21}{42}+\frac{6}{42}+\frac{-14}{42}+\frac{7}{42}\)

\(C=\frac{-22}{42}\)

\(\Rightarrow C=\frac{-11}{21}\)

Vậy \(C=\frac{-11}{21}\)

Answer 2

C=\(\frac{-105}{210}+\frac{30}{210}+\frac{-70}{210}+\frac{-35}{210}=\frac{\left(-105\right)+30+\left(-70\right)+\left(-35\right)}{210}=\frac{-180}{210}=\frac{-6}{7}\)

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