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

Toán Lớp 8: D=(x-2)^3-(x-3)(x^2+3x+9)+6(x+1)^2

Toán Lớp 8: D=(x-2)^3-(x-3)(x^2+3x+9)+6(x+1)^2

Comments ( 2 )

  1. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-d-2-3-3-2-3-9-6-1-2

  2. D = (x – 2)^3 – (x – 3)(x^2 + 3x + 9) + 6(x + 1)^2
    D = x^3 – 6x^2 + 12x – 8 – (x^3 + 3x^2 + 9x – 3x^2 – 9x – 27) + 6(x^2 + 2x + 1)
    D = x^3 – 6x^2 + 12x – 8 – x^3 – 3x^2 – 9x + 3x^2 + 9x + 27 + 6x^2 + 12x + 6
    D = (x^3 – x^3) + (6x^2 – 6x^2 + 3x^2 – 3x^2) + (9x – 9x + 12x + 12x) + (-8 + 6 + 27)
    D = 24x + 25  

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

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