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

Toán Lớp 8: x(x+1)-x^2 + 2x =6 (2x-3)^2+ 4x-9= 0

Toán Lớp 8: x(x+1)-x^2 + 2x =6
(2x-3)^2+ 4x-9= 0

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     a) x(x+1)-x^2+2x=6
    <=>x^2+x-x^2+2x=6
    <=>3x=6
    <=>x=2
     Vậy x=2
     b) (2x-3)^2+4x-9=0
    <=>4x^2-12x+9+4x-9=0
    <=>4x^2-8x=0
    <=>4x(x-2)=0
    <=>x(x-2)=0
    <=>$\left[\begin{matrix} x=0\\ x-2=0\end{matrix}\right.$
    <=>$\left[\begin{matrix} x=0\\ x=2\end{matrix}\right.$
     Vậy x=0 hoặc x=2

  2. #huy
     a)x(x+1)-x^2+2x=6
    <=>x^2+x-x^2+2x=6
    <=>3x=6
    <=>x=2
    b)(2x-3)^2+4x-9=0
    <=>4x^2-12x+9+4x-9=0
    <=>4x^2-8x=0
    <=>4x(x-2)=0
    <=>x(x-2)=0
    <=>[(x=0),(x-2=0):}
    <=>[(x=0),(x=2):}

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