Question

tìm x 

a) x+2/7=6/9

    x       =............

    x       =............

b)8/7-x=5/11

          x =................

          x=.................

giúp em với khó cóa

 

             

Answer 1

a)

\(x+\dfrac{2}{7}=\dfrac{6}{9}\)

\(x=\dfrac{6}{9}-\dfrac{2}{7}\)

\(x=\dfrac{42}{63}-\dfrac{18}{63}\)

\(x=\dfrac{8}{21}\)

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b)

\(\dfrac{8}{7}-x=\dfrac{5}{11}\)

\(x=\dfrac{8}{7}-\dfrac{5}{11}\)

\(x=\dfrac{88}{77}-\dfrac{35}{77}\)

\(x=\dfrac{53}{77}\)

Answer 2

a) x + \(\dfrac{2}{7}\) = \(\dfrac{6}{9}\) 

    x         = \(\dfrac{6}{9}\) - \(\dfrac{2}{7}\) 

    x         = \(\dfrac{8}{21}\) 

 

b) \(\dfrac{8}{7}\) - x = \(\dfrac{5}{11}\) 

           x = \(\dfrac{8}{7}\) - \(\dfrac{5}{11}\) 

           x = \(\dfrac{53}{77}\)