Giúp mình bài này với ạ

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Giúp mình bài này với ạ
giup-minh-bai-nay-voi-a

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Minh Khuê 5 years 2021-05-16T15:40:35+00:00 2 Answers 19 views 0

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  1. Tryphena
    0
    2021-05-16T15:41:37+00:00
    Reply

    e, $\frac{1}{3}$x- $\frac{2}{5}$(x-1)=0

    ⇔$\frac{1}{3}$x+$\frac{2}{5}$x- $\frac{2}{5}$ =0

    ⇔ $\frac{5}{15}$x+$\frac{6}{15}$x= $\frac{2}{5}$

    ⇔$\frac{11}{15}$x= $\frac{2}{5}$ 

    ⇔x=$\frac{2}{5}$: $\frac{11}{15}$ 

    ⇒x=$\frac{2}{5}$× $\frac{15}{11}$ 

    ⇒x=$\frac{6}{11}$ 

    f, 0,5-$\frac{2}{3}$x=$\frac{7}{12}$ 

    ⇔$\frac{2}{3}$x=0,5- $\frac{7}{12}$ 

    ⇔$\frac{2}{3}$x=$\frac{6}{12}$- $\frac{7}{12}$

    ⇔$\frac{2}{3}$x=$\frac{-1}{12}$ 

    ⇔x=$\frac{-1}{12}$ :$\frac{2}{3}$

    ⇔x=$\frac{-1}{12}$×$\frac{3}{2}$

    ⇔x=$\frac{-1}{8}$ 

    g, 2.|$\frac{1}{2}$x- $\frac{1}{5}$ |-$\frac{3}{2}$= $\frac{1}{4}$ 

    ⇔ 2.|$\frac{1}{2}$x- $\frac{1}{5}$ |=$\frac{7}{4}$ 

    ⇔|$\frac{1}{2}$x- $\frac{1}{5}$ |=$\frac{7}{8}$

    th1: $\frac{1}{2}$x- $\frac{1}{5}$ =$\frac{7}{8}$

      ⇔ $\frac{1}{2}$x=$\frac{43}{40}$ 

    ⇒x=$\frac{43}{20}$

    th2 :$\frac{1}{2}$x- $\frac{1}{5}$ =$\frac{-7}{8}$

    ⇔ $\frac{1}{2}$x=$\frac{-27}{40}$ 

    ⇒x=$\frac{-27}{20}$ 

  2. quangkhai
    0
    2021-05-16T15:42:27+00:00
    Reply

    Đáp án:

    f) 0.5 – 2/3 . x = 7/12

    1/2 – 2/3 . x = 7/2

    2/3 . x = 1/2 – 7/2

    2/3 . x = -2/1

    x = 2/3 : -2/1

    x = 2/3 . -1/2

    x = -2/6 = -1/3

    g) 2 . | 1/2 . x – 1/3 | – 3/2 = 1/4

    2. | 1/2 . x – 1/3 | = 1/4 – 3/2

    2 . | 1/2 . x – 1/3 | = 1/4 – 6/4

    2 . | 1/2 . x – 1/3 | = -5/4

    | 1/2 . x – 1/3 | = -5/4 . 2

    1/2 . x – 1/3 = -5/2

    1/2 . x = -5/2  + 1/3

    1/2 . x = -13/6

    x = -13/6 : 1/2

    x = -13/6 . 2/1

    x = -26/6

    (Mình không biết làm phần đầu xin lỗi câu nhiều)

     

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