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

Toán Lớp 8: (4x^2+2x+1)(2x-1)-4x(2x^2-3)=23

Toán Lớp 8: (4x^2+2x+1)(2x-1)-4x(2x^2-3)=23

Comments ( 2 )

  1. (4x^2+2x+1)(2x-1)-4x(2x^2-3)=23
    (2x)^3-1^3-8x^3+12x=23
    8x^3-1-8x^3+12x=23
    12x-1=23
    12x=24
    x=24:12
    x=2

  2. (4x^2+2x+1)(2x-1)-4x(2x^2-3)=23
    ⇔8x^3-1-8x^3+12x=23
    ⇔12x=23+1
    ⇔12x=24
    ⇔x=2
    Vậy x=2
     

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