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

Toán Lớp 8: tìm x (3x-2)^2 – (4-3x)^2 = 20

Toán Lớp 8: tìm x
(3x-2)^2 – (4-3x)^2 = 20

Comments ( 2 )

  1. (3x-2)^2-(4-3x)^2=20
    <=>(3x-2-4+3x)(3x-2+4-3x)=20
    <=>(6x-6).2=20
    <=>6x-6=10
    <=>6(x-1)=10
    <=>x-1=10/6
    <=>x=8/3
    Vậy phương trình có nghiệm là x=8/3
    #Wuang
     

  2. (3x-2)^2 – (4-3x)^2 = 20
    (3x-2+4-3x)(3x-2-4+3x)=20
    2(6x-6)=20
    (6x-6)=20:2
    6x-6=10
    6x=10+6
    6x=16
    x=8/3
    to Vậy x=8/3
     

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