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

Toán Lớp 8: Tìm x: a) 4x^2-6x=0 b) x^2+2x(x-1)-3x^2=2

Toán Lớp 8: Tìm x:
a) 4x^2-6x=0
b) x^2+2x(x-1)-3x^2=2

Comments ( 2 )

  1. $a) 4x^2-6x=0 $
    $⇔2x(2x-3)=0$
    $⇔$\(\left[ \begin{array}{l}2x=0\\2x-3=0\end{array} \right.\) 
    $⇔$\(\left[ \begin{array}{l}x=0\\x=\frac{3}{2}\end{array} \right.\) 
     $Vậy$ $S={0;\frac{3}{2}}$
    $b) x^2+2x(x-1)-3x^2=2$
    $⇔x^2+2x^2-2x-3x^2=2$
    $⇔-2x=2$
    $⇔x=-1$
    $Vậy$ $S={-1}$

  2. Giải đáp + Lời giải và giải thích chi tiết:
    a)4x^2 -6x=0
    <=>2x(2x-3)=0
    <=>[(2x=0),(2x-3=0):}
    <=>[(x=0),(2x=3):}
    <=>[(x=0),(x=3/2):}
    Vậy x in {0;3/2}
    b)x^2 +2x(x-1)-3x^2=2
    <=>x^2 +2x^2 -2x-3x^2=2
    <=>(x^2 +2x^2 -3x^2 )-2x=2
    <=>-2x=2
    <=>x=-1
     Vậy x=-1

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