计算.3X³-2X²-y²+5y+X²-5y+y²

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计算.3X³-2X²-y²+5y+X²-5y+y²计算.3X³-2X²-y²+5y+X²-5y+y²

计算.3X³-2X²-y²+5y+X²-5y+y²
计算.3X³-2X²-y²+5y+X²-5y+y²

计算.3X³-2X²-y²+5y+X²-5y+y²
3X³-2X²-y²+5y+X²-5y+y²
=3X³-(2-1)X²+(y²-y²)+(5y-5y)
=3X³-X²