若一个多项式与-2x²的积为-2x^5+4x³-x²,则这个多项式为______
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若一个多项式与-2x²的积为-2x^5+4x³-x²,则这个多项式为______
若一个多项式与-2x²的积为-2x^5+4x³-x²,则这个多项式为______
若一个多项式与-2x²的积为-2x^5+4x³-x²,则这个多项式为______
x³-2x+1/2