化简:(x-1)(2x^2-3x+2)-x(x+1)(x-2)
2个回答
原式=2x³-3x²+2x-2x²+3x-2-x(x²-x-2)
=2x³-5x²+5x-2-x³+x²+2x
=x³-4x²+7x-2
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