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

Toán Lớp 7: 2x – 2/3 -7x = 3/2 -1 giúp mik với đc ko ạ

Toán Lớp 7: 2x – 2/3 -7x = 3/2 -1
giúp mik với đc ko ạ

Comments ( 2 )

  1. 2x – 2/3 – 7x = 3/2 – 1
    2x – 7x – 2/3 = 3/2 – 2/2
    (2 – 7) . x – 2/3 = 1/2
    -5x – 2/3 = 1/2
    -5x = 1/2 + 2/3
    -5x = 7/6
    x = 7/6 : -5
    x = -7/30
     

  2. 2x-2/3-7x=3/2-1
    ⇒(2x-7x)-2/3=3/2-2/2
    ⇒(2-7).x-2/3=1/2
    ⇒(-5x)-2/3=1/2
    ⇒-5x=1/2+2/3
    ⇒-5x=3/6+4/6
    ⇒-5x=7/6
    ⇒-x=7/6:5
    ⇒-x=7/6. 1/5
    ⇒-x=(7.1)/(6.5)
    ⇒-1.x=7/30
    ⇒x=7/30:(-1)
    ⇒x=-7/30.
    Vậy x=-7/30.

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