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

Toán Lớp 6: x^2-11x+10=0 x^2-25=0 2x^2-9x-11=0

Toán Lớp 6: x^2-11x+10=0
x^2-25=0
2x^2-9x-11=0

Comments ( 2 )

  1. x^2-11x+10=0
    x^2-x-10x+10=0
    x(x-1)-10(x-1)=0
    (x-1)(x-10)=0
    $\left[ \begin{array}{l}x=10\\x=1\end{array} \right.$
    Vậy x={10;1}
    x^2-25=0
    x^2=25
    $\left[ \begin{array}{l}x=5\\x=-5\end{array} \right.$
    Vậy x={5;-5}
    2x^2-9x-11=0
    2x^2+2x-11x-11=0
    2x(x-1)-11(x+1)=0
    (x-1)(2x-11)=0
    $\left[ \begin{array}{l}x=-1\\x=\frac{11}{2}\end{array} \right.$
    Vậy x={-1;11/2}
     

  2. Giải đáp:
    x^2-11x+10=0
    $x^{2}$ -x-10x+10=0
    x(x-1)-10(x-1)=0
    (x-1)(x-10)=0
    \(\left[ \begin{array}{l}x=10\\x=1\end{array} \right.\)
    2)x^2-25=0
    $x^{2}$ =25
    \(\left[ \begin{array}{l}x=5\\x=-5\end{array} \right.\)
    3)2x^2-9x-11=0
    $2x^{2}$ +2x-11x-11=0
    2x(x-1)-11(x+1)=0
    (x-1)(2x-11)=0
    \(\left[ \begin{array}{l}x=-1\\x=\frac{11}{2}\end{array} \right.\)
    Lời giải và giải thích chi tiết:
     

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

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