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

Toán Lớp 7: a) (3x+5)^2=9 giải giúp mình với

Toán Lớp 7: a) (3x+5)^2=9
giải giúp mình với

Comments ( 2 )

  1. (3x+5)^2=9
    (3x+5)^2=+-3
    +)3x+5=3
    3x=3-5
    3x=-2
    x=-2:3
    x=-2/3
    +)3x+5=-3
    3x=-3-5
    3x=-8
    x=-8:3
    x=-8/3
    Vậy x={-8/3;-2/3}

  2. #huy
    (3x+5)^2=9
    <=>(3x+5)^2=3^2
    <=>[(3x+5=3),(3x+5=-3):}
    <=>[(3x=3-5=-2),(3x=(-3)-5=-8):}
    <=>[(x=-2:3=-2/3),(x=-8:3=-8/3):}
    Vậy x=-2/3 hoặc x=-8/3
     

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

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