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

Toán Lớp 8: Tìm x: x^2-17x=60 nhanh nha 1-2 phút hoy nha các bác

Toán Lớp 8: Tìm x:
x^2-17x=60
nhanh nha 1-2 phút hoy nha các bác

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    x^2 – 17x=60
    <=> x^2-17x-60=0
    <=>x^2+3x-20x-60=0
    <=>x(x+3)-20(x+3)=0
    <=>(x-20)(x+3)=0
    \(⇔\left[ \begin{array}{l}x-20=0\\x+3=0\end{array} \right.\)
    \(⇔\left[ \begin{array}{l}x=20\\x=-3\end{array} \right.\)
    Vậy S={20;-3}

  2. x^2-17x=60
    x^2-17x-60=0
    x^2-3x+20x-60=0
    x(x+3)-20(x+3)=0
    (x+3)(x-20)=0
    →TH1:x-20=0→x=20
    TH2:x+3=0→x=-3
     

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

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