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

Toán Lớp 8: Tìm x: 5x(x – 3) = 5$x^{2}$ + 7x – 5

Toán Lớp 8: Tìm x:
5x(x – 3) = 5$x^{2}$ + 7x – 5

Comments ( 2 )

  1.  5x.(x – 3) = 5x² + 7x – 5 
    <=> 5x² – 15x = 5x² + 7x – 5 
    <=> 5x² – 15x – 5x² – 7x = – 5 
    <=> – 22x = -5
    <=> x = 5/22 
    Vậy x = 5/22
    Xin ctlhn+5sao+tim
    Chúc cậu học tốt~
    #diepanhsai

  2. 5x(x-3)=5x^2+7x-5
    ⇔5x^2-15x=5x^2+7x-5
    ⇔5x^2-15x-5x^2-7x+5=0
    ⇔(5x^2-5x^2)-(15x+7x)=0-5
    ⇔-22x=-5
    ⇔x=5/22
    Vậy x=5/22

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

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