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

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

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

Comments ( 1 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    (x+1)^3-(x-1)^3-(x^3-1)-(x-1)(x^2+x+1)
    =x^3+3x^2+3x+1-(x^3-3x^2+3x-1)-x^3+1-(x^3-1)
    =x^3+3x^2+3x+1-x^3+3x^2-3x+1-x^3+1-x^3+1
    =(x^3-x^3-x^3-x^3)+(3x^2+3x^2)+(3x-3x)+(1+1+1+1)
    =-2x^3+6x^2+4.
     

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