Bài 60 trang 33 SGK Toán 6 tập 2

Tìm x, biết:

a) \(x - \dfrac{3}{4}=\frac{1}{2}\) ;                              

b) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\) ; 

Lời giải

a) \(x= \dfrac{1}{2}+\dfrac{3}{4}\)

\(x= \dfrac{2+3}{4}\)

\(x=\dfrac{5}{4}\)                     

b) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)

     \(\dfrac{-5}{6}-x=\dfrac{7-4}{12}\) 

      \(\dfrac{-5}{6}-x=\dfrac{3}{12}\).

      \(x=\dfrac{-5}{6}-\dfrac{3}{12}\)

      \(x=\dfrac{(-10)+(-3)}{12}\)

       \(x=\dfrac{-13}{12}.\) 


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