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

Toán Lớp 8: 2x(x-3) = x-3 mngggg ơi giúp mk vssss

Toán Lớp 8: 2x(x-3) = x-3 mngggg ơi giúp mk vssss

Comments ( 2 )

  1. 2x(x-3)=x-3
    ⇔2x(x-3)-(x-3)=0
    ⇔(x-3)(2x-1)=0
    ⇔x-3=0 hoặc 2x-1=0
    ⇔x=3 hoặc x=1/2
    Vậy S={3;1/2}

  2. 2x(x – 3 ) = x – 3
    2x ( x – 3 ) – ( x – 3 ) = 0 
    ( 2x – 1) ( x – 3) = 0
    \(\left[ \begin{array}{l}2x – 1 =0\\x – 3 = 0\end{array} \right.\) 
    \(\left[ \begin{array}{l}x = \frac{1}{2} \\x =3\end{array} \right.\)
    Vậy S = { $\frac{1}{2}$ ; 3 }

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