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

Toán Lớp 8: Giải phương trình (x- 1). (2x – 3) – 2x^2 = 0

Toán Lớp 8: Giải phương trình (x- 1). (2x – 3) – 2x^2 = 0

Comments ( 2 )

  1. (x-1)(2x-3)-2x^2=0
    ⇔2x^2-3x-2x+3-2x^2=0
    ⇔-5x=-3
    ⇔x=3/5
    Vậy x=3/5
     

  2. (x-1)(2x-3)-2x^2=0
    x.(2x-3)-(2x-3)-2x^2=0
    2x^2-3x-2x+3-2x^2=0
    -5x+3=0
    -5x=-3
    x=3/5

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

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