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

Toán Lớp 8: Tìm x a)(2x-3)(x+3)-x(2x+5)=7 b)x^2-x=0

Toán Lớp 8: Tìm x
a)(2x-3)(x+3)-x(2x+5)=7
b)x^2-x=0

Comments ( 2 )

  1. Giải đáp:
     a) ⇔ 2x²+6x-3x-9-2x²-5x=7
    ⇔ -2x=7⇔x=$\frac{-7}{2}$ 
    b) ⇔x(x-1)=0⇔\(\left[ \begin{array}{l}x=0\\x-1=0\end{array} \right.\) ⇔\(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\) 
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     $a,(2x-3)(x+3)-x(2x+5)=7$
    $=>(2x-3).x+(2x-3).3-2x^{2}-5x=7$
    $=>2x^{2}-3x+6x-9-2x^{2}-5x=7$
    $=>-2x=7+9$
    $=>x=16:(-2)$
    $=>x=-8$
    $b,x^{2}-x=0$
    $=>x(x-1)=0$
    =>\(\left[ \begin{array}{l}x=0\\x-1=0\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\)

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

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