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

Toán Lớp 8: tìm x (x-2)^2+3=x^2 giúp mik vs

Toán Lớp 8: tìm x
(x-2)^2+3=x^2
giúp mik vs

Comments ( 2 )

  1. Giải đáp:
    x = 7/4
    Lời giải và giải thích chi tiết:
    (x – 2)^2 + 3 = x^2
    (x^2 – 2.x.2 + 2^2 + 3 – x^2 = 0
    (x^2 – 4x + 4) + 3 – x^2 = 0
    x^2 – 4x + 4 + 3 – x^2 = 0
    (x^2 – x^2) – 4x + (4 + 3) = 0
    – 4x + 7 = 0
    – 4x = – 7
    x = {-7}/{-4}
    x = 7/4
    Vậy x = 7/4
    #SunHee

  2. (x-2)^2+3=x^2
    ->x^2-4x+4+3=x^2
    ->x^2-4x+4+3-x^2=0
    ->(x^2-x^2)+(4+3)-4x=0
    ->0+7-4x=0
    ->7-4x=0
    ->-4x=-7
    ->x=\frac{7}{4}
    Vậy x=\frac{7}{4}

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

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