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

Toán Lớp 8: Rút gọn biểu thức A= 4(x-6) -x^2 (2+3x) +x (5x-1) +3x^2 (x-1)

Toán Lớp 8: Rút gọn biểu thức
A= 4(x-6) -x^2 (2+3x) +x (5x-1) +3x^2 (x-1)

Comments ( 2 )

  1. A = 4(x-6)-x^2(2+3x)+x(5x-1)+3x^2(x-1)
    = 4x – 24 – 2x^2 – 3x^3 + 5x^2 – x + 3x^3 – 3x^2
    = (3x^3-3x^3) + (5x^2-3x^2-2x^2) + (4x-x) – 24
    = 3x – 24

  2. A=4(x-6) -x^2(2+3x)+x(5x-1)+3x^2(x-1)
    =4x-24 -2x^2-3x^3 +5x^2 -x +3x^3 -3x^2
    =(-3x^3 +3x^3) +(-2x^3+5x^2-3x^2) +(4x-x) -24
    =           0           +       0                         +3x -24
    =3x-24

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