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

Toán Lớp 8: (2x-1)² – (x-2)×(x+3)-3x²=9 Tìm x

Toán Lớp 8: (2x-1)² – (x-2)×(x+3)-3x²=9
Tìm x

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     (2x-1)^2-(x-2)(x+3)-3x^2=9
    <=>4x^2-4x+1-x^2-3x+2x+6-3x^2-9=0
    <=>-5x-2=0
    <=>-5x=2
    <=>x=(-2)/5
     Vậy =(-2)/5

  2. $(2x-1)^2-(x-2)(x+3)-3x^2=9$
    $⇔ 4x^2-4x+1-(x^2+x-6)-3x^2=9$
    $⇔ -5x+7=9$
    $⇔ x=-\dfrac25$

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

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