4x的立方-(x-2)(3x+1)-2(x-1)(-2分之1·x的平方+2)

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4x的立方-(x-2)(3x+1)-2(x-1)(-2分之1·x的平方+2)

4x的立方-(x-2)(3x+1)-2(x-1)(-2分之1·x的平方+2)
4x的立方-(x-2)(3x+1)-2(x-1)(-2分之1·x的平方+2)

4x的立方-(x-2)(3x+1)-2(x-1)(-2分之1·x的平方+2)
4x^3-(x-2)(3x+1)-2(x-1)(-1/2x^2+2)
=4x^3-(x-2)(3x+1)+(x-1)(x^2-4)
=4x^3-(x-2)(3x+1)+(x-1)(x-2)(x+2)
=4x^3-(x-2)(3x+1-x^2-x+2)
=4x^3+(x-2)(x^2-2x-3)
=4x^3+x^3-2x^2-2x^2+4x-3x+6
=5x^3-4x^2+x+6