作业帮计算:3x(x^2-2x-1)-2x^2(x-3)
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计算:3x(x^2-2x-1)-2x^2(x-3)
计算:3x(x^2-2x-1)-2x^2(x-3)
计算:3x(x^2-2x-1)-2x^2(x-3)
3x(x^2-2x-1)-2x^2(x-3)
=3x^3-6x^2-3x-2x^3+6x^2
=x^3-3x
3x(x^2-2x-1)-2x^2(x-3)
=3x^3-6x^2-3x-2x^3+6x^2
=x^3-3x
=x(x-3)
3x(x^2-2x-1)-2x^2(x-3)
=3x^3-6x^2-3x-2x^3+6x^2
=x^3-3x.
3x(x^2-2x-1)-2x^2(x-3)
=3x^3-6x^2-3x-2x^3+6x^2
=x^3-3x
=x(x^2-3)
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