Question

Tìm giá trị của x biết:

a) x - 3/5 = 1 - 4/5 + 1/6

b) ( - 10/4 ) + 1/4 = 3/4 

c) -3/2 + ( x - 1/2 ) = 1/2

d) x - 2/7 = 7/2 1

đ) ( 1/6 + 1/10 - 1/15 ) + x = 0

Answer 1

a; \(x\) - \(\dfrac{3}{5}\) = 1 - \(\dfrac{4}{5}\) + \(\dfrac{1}{6}\)

    \(x\) - \(\dfrac{3}{5}\) = \(\dfrac{30}{30}\) - \(\dfrac{24}{30}\) + \(\dfrac{5}{30}\)

    \(x\) - \(\dfrac{3}{5}\) = \(\dfrac{6}{30}\) + \(\dfrac{5}{30}\)

    \(x\) - \(\dfrac{3}{5}\) =  \(\dfrac{11}{30}\)

   \(x\)        = \(\dfrac{11}{30}\) + \(\dfrac{3}{5}\)

   \(x\)        = \(\dfrac{11}{30}\) + \(\dfrac{18}{30}\)

    \(x\)      = \(\dfrac{29}{30}\)

Vậy \(x\) = \(\dfrac{29}{30}\) 

Answer 2

b; (- \(\dfrac{10}{4}\)) + \(\dfrac{1}{4}\) = \(\dfrac{3}{4}\) thế \(x\) của em đâu nhỉ???

c; - \(\dfrac{3}{2}\) + (\(x\) - \(\dfrac{1}{2}\)) = \(\dfrac{1}{2}\)

             \(x\) - \(\dfrac{1}{2}\)  = \(\dfrac{1}{2}\) + \(\dfrac{3}{2}\)

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

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

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

             \(x\)       = \(\dfrac{5}{2}\)

Vậy \(x=\dfrac{5}{2}\)

 

           

         

Answer 3

d; \(x\) - \(\dfrac{2}{7}\) = \(\dfrac{7}{21}\)

    \(x\)       = \(\dfrac{7}{21}\) + \(\dfrac{2}{7}\)

     \(x\)     =  \(\dfrac{7}{21}\) + \(\dfrac{6}{21}\)

     \(x\)     = \(\dfrac{13}{21}\)

Vậy \(x=\dfrac{13}{21}\)

Answer 4

đ;  (\(\dfrac{1}{6}\) + \(\dfrac{1}{10}\) - \(\dfrac{1}{15}\)) + \(x\) = 0 

    (\(\dfrac{5}{30}\) + \(\dfrac{3}{30}\) - \(\dfrac{2}{30}\)) + \(x\) = 0

    (\(\dfrac{8}{30}\) - \(\dfrac{2}{30}\)) + \(x\) = 0 

       \(\dfrac{1}{5}\)         + \(x\) = 0 

                        \(x\) = - \(\dfrac{1}{5}\)

Vậy \(x\) = - \(\dfrac{1}{5}\)