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

Toán Lớp 8: 2x(5-x)-9(x-5)=0 giupspppppppppppppp

Toán Lớp 8: 2x(5-x)-9(x-5)=0 giupspppppppppppppp

Comments ( 2 )

  1. 2x(5-x)-9(x-5)=0
    ⇔2x(5-x)+9(5-x)=0
    ⇔(5-x)(2x+9)=0
    ⇔5-x=0⇒x=5
    2x+9=0⇒2x=-9⇒x=-9/2
    Vậy x={5,-9/2}

  2. Giải đáp + Lời giải và giải thích chi tiết:
     2x(5-x)-9(x-5)=0
    ⇔ 2x(5-x)+9(5-x)=0
    ⇔ (5-x)(2x+9)=0
    ⇔ $\left[\begin{matrix} 5-x=0\\ 2x+9=0\end{matrix}\right.$
    ⇔ $\left[\begin{matrix} x=5\\ x=\dfrac{-9}{2}\end{matrix}\right.$
    Vậy S={(-9)/2; 5}

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