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

Toán Lớp 8: Tìm x biết (2x+1) ∧ + (x-2) ∧2 – 5 (x-3)(x+3)=0

Toán Lớp 8: Tìm x biết
(2x+1) ∧ + (x-2) ∧2 – 5 (x-3)(x+3)=0

Comments ( 2 )

  1. (2x+1)^2+ (x-2)^2 – 5 (x-3)(x+3)=0
    →4x^2+4x+1+(x-2)^2-5(x-3)(x+3)=0
    →4x^2+4x+1+x^2-4x+4-5x^2-15x+15x+45=0
    →50=0(vô lí)

  2. (2x + 1)^2 + (x – 2)^2 – 5(x – 3)(x + 3) = 0
    ⇔ 4x^2 + 4x + 1 + x^2 – 4x + 4 – 5(x^2 – 9) = 0
    ⇔ 5x^2 + 5 – 5x^2 + 45 = 0
    ⇔ 50 = 0  ( vô  lí )
    text(Vậy phương trình vô nghiệm)

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

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