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

Toán Lớp 8: (x-2)^3 -(x-3)(x^2+3x+9)+12(x+1)^2

Toán Lớp 8: (x-2)^3 -(x-3)(x^2+3x+9)+12(x+1)^2

Comments ( 2 )

  1. (x-2)^3-(x-3)(x^2+3x+9)+12(x+1)^2
    =x^3-6x^2+12x-8-x^3+27+12(x^2+2x+1)
    =-6x^2+12x+19+12x^2+24x+12
    =6x^2+36x+27
    Cho mk xin hay nhất please
    Thank you

  2. $= x^3 – 6x^2 + 12x – 8 – (x^3 – 27) + 12(x^2+2x+1)$
    $= x^3 – 6x^2 + 12x – 8 – x^3 + 27 + 12x^2 + 24x + 12$
    $=6x^2 + 36x + 31$
    Bài này phụ thuộc vào x nha tus

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