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

Toán Lớp 7: (x-5)^2=(1-3x)^2 Giúp mình với

Toán Lớp 7: (x-5)^2=(1-3x)^2
Giúp mình với

Comments ( 1 )

  1. (x-5)^2=(1-3x)^2
    <=>x-5=+-(1-3x)
    <=>[(x-5=1-3x),(x-5=-(1-3x)):}
    <=>[(x+3x=1+5),(x-5=-1+3x):}
    <=>[(4x=6),(x-3x=-1+5):}
    <=>[(x=3/2),(-2x=4):}
    <=>[(x=3/2),(x=-2):}
    Vậy x=3/2 hoặc x=-2

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