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

Toán Lớp 8: Tìm $x$, biết : $x^{2}$ – $3x$ = $0$

Toán Lớp 8: Tìm $x$, biết : $x^{2}$ – $3x$ = $0$

Comments ( 2 )

  1. x^2-3x=0
    <=>x(x-3)=0
    <=>$\left[\begin{matrix}x=0\\ x-3=0\end{matrix}\right.$
    <=>$\left[\begin{matrix} x=0\\ x=3\end{matrix}\right.$
    Vậy S={0;3}
     

  2. x² – 3x = 0
    ⇔ x(x-3)=0
    ⇔ x = 0 hoặc x -3 = 0
    ⇔ x = 0 hoặc x = 3
    Vậy x = 3

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