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

Toán Lớp 8: Rút gọn (X+2)^3 + (x-3)^2 – x^2(x+5)

Toán Lớp 8: Rút gọn
(X+2)^3 + (x-3)^2 – x^2(x+5)

Comments ( 2 )

  1. (x+2)^3 +(x-3)^2 -x^2(x+5)
    =x^3 + 6x^2 + 12x + 8 + x^2 – 6x + 9 – x^3 – 5x^2
    =(x^3 – x^3) + (6x^2 +x^2 – 5x^2) + (12x-6x)  +(8+9)
    =2x^2 + 6x + 17
     

  2. (x+2)^3+(x-3)^2-x^2(x+5)
    =x^3+6x^2+12x+8+x^2-6x+9-x^3-5x^2
    =2x^2+6x+17
     

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