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

Toán Lớp 8: (x+1) (2x – 3) – (x – 3) (x + 3) = 4

Toán Lớp 8: (x+1) (2x – 3) – (x – 3) (x + 3) = 4

Comments ( 2 )

  1. $(x+1)(2x−3)−(x−3)(x+3)=4$
    ⇔$ 2x^2−3x+2x−3−x^2+9−4=0$
    ⇔$x^2-x+2=0$

  2. (x+1) (2x-3) – (x – 3) (x + 3) = 4
    ⇔ 2x^2 – 3x + 2x – 3 – x^2 + 9 – 4 = 0
    ⇔ x^2 – x + 2 = 0
    ⇔ x^2 + x – 2x + 2 = 0
    ⇔ x(x+1) -2(x-1) = 0
    *Góp ý : Mình nghĩ đề bài sai nhé nhờ bạn ktra lại
     

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