Giúp mình vs,thanks ạ

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Giúp mình vs,thanks ạ
giup-minh-vs-thanks-a

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Dulcie 4 years 2020-10-19T14:15:22+00:00 2 Answers 67 views 0

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  1. Nho
    0
    2020-10-19T14:16:57+00:00
    Reply

    Bài 1:

    a) `x/4=5/2`

    `⇒ 2x=4.5=20`

    `⇒ x=10`

    b) `(1/2)/x =(3/4)/(2/3)`

    `⇒ 3/4x=1/2 .2/3`

    `⇒ 3/4x=1/3`

    `⇒ x=4/9`

    c) `x/2=8/x`

    `⇒ x²=8.2=16`

    `⇒ x=±4`

    Bài 2:

    `-3/12=-30/120`

    `(-3)/(-30)=12/120`

    `120/12=(-30)/(-3)`

    `120/(-30)=12/(-3)`

  2. Helga
    0
    2020-10-19T14:17:08+00:00
    Reply

    Bạn tham khảo!
    Bài 1
    $a)$ $\dfrac{x}{4}$ $=$ $\dfrac{5}{2}$
    $→$ $x$ $.$ $2$ $=$ $4$ $.$ $5$
    $→$ $x$ $.$ $2$ $=$ $20$
    $→$ $x$ $=$ $20$ $:$ $2$
    $→$ $x$ $=$ $10$
    $b)$ $1/2/x$ $=$ $3/4/2/3$
    $→$ $\dfrac{0.5}{x}$ $=$ $\dfrac{0.75}{0.67}$
    $→$ $x$ $.$ $0.75$ $=$ $0.5$ $.$ $0.67$
    $→$ $x$ $.$ $0.75$ $=$ $\dfrac{67}{200}$
    $→$ $x$ $=$ $\dfrac{67}{200}$ $:$ $0.75$
    $→$ $x$ $=$ $\dfrac{67}{150}$
    $c)$ $\dfrac{x}{2}$ $=$ $\dfrac{8}{x}$
    $→$ $x$ $.$ $x$ $=$ $2$ $.$ $8$
    $→$ $2x$ $=$ $16$
    $→$ $x$ $=$ $16$ $:$ $2$
    $→$ $x$ $=$ $4$ và $x$ $=$ $-4$
    Bài 2
    $-3$ $.$ $420$ $=$ $12$ $.$ $-30$
    $→$ $\dfrac{-3}{12}$ $=$ $\dfrac{420}{-30}$
    $→$ $\dfrac{12}{-3}$ $=$ $\dfrac{-30}{420}$
    $→$ $\dfrac{12}{-30}$ $=$ $\dfrac{-3}{420}$
    $→$ $\dfrac{-30}{12}$ $=$ $\dfrac{420}{-3}$
    $FbBinhne2k88$

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )