Question

Tìm x phân số:

x - 1/2 = 4/7

19/7 - x = 27/2 - 1

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Answer 1

\(x-\dfrac{1}{2}=\dfrac{4}{7}\\ x=\dfrac{4}{7}+\dfrac{1}{2}\\ x=\dfrac{15}{14}\\ \dfrac{19}{7}-x=\dfrac{27}{2}-1\\ \dfrac{19}{7}-x=\dfrac{25}{2}\\ x=\dfrac{19}{7}-\dfrac{25}{2}\\ x=-\dfrac{137}{14}\)

Answer 2

\(x=\dfrac{4}{7}+\dfrac{1}{2}=\dfrac{8}{14}+\dfrac{7}{14}=\dfrac{15}{14}\)

Answer 3

x - 1/2 = 4/7                             19/7 - x = 27/2 -1

      x= 4/7 + 1/2                       19/7 - x = 25/2

     x= 15/14                                       x=19/7 - 25/2 

                                                         x= -137/14

Answer 4

\(x-\dfrac{1}{2}=\dfrac{4}{7}\)

\(x=\dfrac{4}{7}+\dfrac{1}{2}\)

\(x=\dfrac{8}{14}+\dfrac{7}{14}\)

\(x=\dfrac{15}{14}\)

b) \(\dfrac{19}{7}-x=\dfrac{27}{2}-1\)

    \(\dfrac{19}{7}-x=\dfrac{25}{2}\)

              \(x=\dfrac{19}{7}-\dfrac{25}{2}\)

              \(x=-\dfrac{137}{14}\)