Question

Bài 2: Tìm x biết:

a) x/12 = -1/24 - 1/8

b) 2/3 . x - 1/2 . x = 15/12

 

Answer 1

a) x/12 = -1/24 - 1/8

    x/12 = -1/6

    x/12 = 2/12

        x  = 2 X 12 : 12 

  Vậy x = 2

b) 2/3 . x - 1/2 .x = 5/4

          x.(2/3-1/2) = 5/4

          x.1/6       = 5/4

          x             = 5/4 :1/6

    Vậy x            = 15/2

Answer 2

a, x = -2

b, x = 15/2

Answer 3

mình đã trình bày rõ ràng rồi, k cho mình đi.

Answer 4

a) \(\frac{x}{12}=\frac{-1}{24}-\frac{1}{8}\)

\(\Rightarrow\frac{x}{12}=\frac{-1}{6}\)

\(\Rightarrow x=\frac{-1}{6}.12\)

\(\Rightarrow x=-2\)

Vậy x = -2

b) \(\frac{2}{3}.x-\frac{1}{2}.x=\frac{15}{12}\)

\(\Rightarrow x\left(\frac{2}{3}-\frac{1}{2}\right)=\frac{15}{12}\)

\(\Rightarrow x.\frac{1}{6}=\frac{15}{12}\)

\(\Rightarrow x=\frac{15}{12}\div\frac{1}{6}\)

\(\Rightarrow x=\frac{15}{2}\)

Vậy \(x=\frac{15}{2}\)