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

Toán Lớp 8: (x^ 2 -1)(x+2)-(x-2)(x^ 2 +2x+4) Rút gọn

Toán Lớp 8: (x^ 2 -1)(x+2)-(x-2)(x^ 2 +2x+4)
Rút gọn

Comments ( 1 )

  1. (x^2 -1)(x+2)-(x-2)(x^2 +2x+4)
    =x^3+2x^2-x-2-(x^3+2x^2+4x-2x^2-4x-8)
    =x^3+2x^2-x-2-x^3-2x^2-4x+2x^2+4x+8
    =(x^3-x^3)+(2x^2-2x^2+2x^2)+(-x-4x+4x)+(-2+8)
    =2x^2-x+6
    #owen
     

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