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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: giúp mình vs ạ Tìm x: 2x-1 / 3 = x+1 / 2

Toán Lớp 7: giúp mình vs ạ
Tìm x: 2x-1 / 3 = x+1 / 2

Comments ( 2 )

  1. {2x-1}/3 = {x+1}/2
    $\Leftrightarrow$ {2x-1}/3 = {2 . (x+1)}/{2.2}
    $\Leftrightarrow$ {2x-1}/3 = {2x + 2}/4
    $\Leftrightarrow$ 4 . (2x – 1) = 3 . (2x + 2)
    $\Leftrightarrow$ 8x – 4 = 6x + 6
    $\Leftrightarrow$ 8x – 6x = 6 + 4
    $\Leftrightarrow$ 2x = 10
    $\Leftrightarrow$ x = 10 : 2
    $\Leftrightarrow$ x = 5
    $\text{Vậy}$ x = 5
     

  2. (2x-1)/3=(x+1)/2
    =>2(2x-1)=3(x+1)
    =>4x-2=3x+3
    =>4x-3x=3+2
    =>x=5
    vậy x=5 
    ___________________________________
    áp dụng: a/b=c/d=>a.d=c.b 
     

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222-9+11+12:2*14+14 = ? ( )