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

Toán Lớp 6: Tìm x số nguyên A, ( 4 – x ).( 2x + 12) = 0

Toán Lớp 6: Tìm x số nguyên
A, ( 4 – x ).( 2x + 12) = 0

Comments ( 2 )

  1. ( 4 – x ).( 2x + 12) = 0
    ⇒\(\left[ \begin{array}{l}4-x=0\\2x+12=0\end{array} \right.\)
    ⇒\(\left[ \begin{array}{l}x=4-0\\2x=0-12\end{array} \right.\)
    ⇒\(\left[ \begin{array}{l}x=4\\2x=-12\end{array} \right.\)
    ⇒\(\left[ \begin{array}{l}x=4\\x=-6\end{array} \right.\)
    to Vậy x∈{4;-6}
     

  2. (4-x).(2x+12)=0
    Th1: 4-x=0
             x=4-0
             x=4
    Th2: 2x+12=0
            2x=0-12
            2x=(-12)
            x=(-12):2
            x=(-6)
    Vậy x=4 hoặc x=(-6)
     

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

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