Question

[Tran Thu]

Giúp mik với, dạng 2 nhé

Answer 1

[Nguyễn Thị Thương Hoài]

Bài 3:

a; \(\dfrac{-4}{9}\) - 2\(x\) = \(\dfrac{5}{-12}\) - \(\dfrac{-5}{9}\)

    \(\dfrac{-4}{9}\) - 2\(x\) = \(\dfrac{5}{36}\)

            2\(x\) = \(\dfrac{-4}{9}\) - \(\dfrac{5}{36}\)

            2\(x\) = - \(\dfrac{7}{12}\)

              \(x\) = - \(\dfrac{7}{12}\) : 2

               \(x\) = - \(\dfrac{7}{24}\)

Vậy \(x\) = - \(\dfrac{7}{24}\)

b; \(\dfrac{1}{2}\)(\(x\) + 2) + \(\dfrac{3}{8}\) = \(\dfrac{7}{16}\)

    \(\dfrac{1}{2}\)\(x\) + 1 + \(\dfrac{3}{8}\) = \(\dfrac{7}{16}\)

     \(\dfrac{1}{2}x\)  + \(\dfrac{11}{8}\)     = \(\dfrac{7}{16}\)

       \(\dfrac{1}{2}\)\(x\)              = \(\dfrac{7}{16}\) - \(\dfrac{11}{8}\)

        \(\dfrac{1}{2}x\)            = - \(\dfrac{15}{16}\)

           \(x\)           = - \(\dfrac{15}{16}\) \(\times\) 2

           \(x\)          = - \(\dfrac{15}{8}\)

Vậy \(x\) = - \(\dfrac{15}{8}\) 

Answer 2

[Nguyễn Thị Thương Hoài]

c; (\(\dfrac{1}{3}\) - \(x\)) : \(\dfrac{3}{4}\) + \(\dfrac{1}{4}\) = - \(\dfrac{2}{3}\)

    (\(\dfrac{1}{3}\) - \(x\)) : \(\dfrac{3}{4}\)        = - \(\dfrac{2}{3}\) - \(\dfrac{1}{4}\)

    (\(\dfrac{1}{3}\) - \(x\)) : \(\dfrac{3}{4}\)        = - \(\dfrac{11}{12}\)

     \(\dfrac{1}{3}\) - \(x\)              = - \(\dfrac{11}{12}\) x \(\dfrac{3}{4}\)

      \(\dfrac{1}{3}\) - \(x\)            = - \(\dfrac{11}{16}\)

             \(x\)            =  \(\dfrac{1}{3}\) + \(\dfrac{11}{16}\)

              \(x\)           = \(\dfrac{49}{48}\)

Vậy \(x\) = \(\dfrac{49}{48}\)