Question by Summer Clouds - Discuss with MathYouLike

Summer Clouds

21/06/2017 at 10:56

The sum of the three fractions \(\dfrac{1}{3},\dfrac{4}{7}\) and \(\dfrac{-5}{21}\) is :
\(A.\dfrac{2}{3}\)
\(B.\dfrac{3}{31}\)
\(C.\dfrac{24}{21}\)
\(D.\dfrac{27}{42}\)

List of answers

Phan Minh Anh 21/06/2017 at 15:47

1/3 +4/7 +-5/21=7/21+5/21=14/21=2/3

The answer is A.
Phan Thanh Tinh Coordinator 21/06/2017 at 12:18

\(\dfrac{1}{3}+\dfrac{4}{7}+\dfrac{-5}{21}=\dfrac{7}{21}+\dfrac{12}{21}-\dfrac{5}{21}=\dfrac{14}{21}=\dfrac{2}{3}\)

Hence,the answer is A

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