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

Toán Lớp 8: a, (x-4)(2x-6)=0 b, (x-1)x-(x-1).(2x-5)=-0

Toán Lớp 8: a, (x-4)(2x-6)=0
b, (x-1)x-(x-1).(2x-5)=-0

Comments ( 2 )

  1. a) (x – 4)(2x – 6) = 0
    x – 4 = 0  hoặc  2x – 6 = 0
    x = 4  hoặc  2x = 6
    x = 4  hoặc  x = 3
    b) (x – 1)x – (x – 1).(2x – 5) = 0
    (x – 1)(x – 2x + 5) = 0
    (x – 1)(5 – x) = 0
    x – 1 = 0  hoặc  5 – x = 0
    x = 1  hoặc  x = 5
    XIN 5 SAO VÀ CTLH NHA 

  2. a, (x-4)(2x-6)=0
    ⇒ \(\left[ \begin{array}{l}x-4=0\\2x-6=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=4\\x=3\end{array} \right.\) 
    Vậy x=4 hoặc x=3.
    b, (x-1)x-(x-1).(2x-5)=0
    ⇔ (x-1)(x-2x+5)=0
    ⇔(x-1)(5-x)=0
    ⇒ \(\left[ \begin{array}{l}x-1=0\\5-x=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=1\\x=5\end{array} \right.\) 
    Vậy x=1 hoặc x=5.

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

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