计算.3X³-2X²-y²+5y+X²-5y+y²
问题描述:
计算.3X³-2X²-y²+5y+X²-5y+y²
答
3X³-2X²-y²+5y+X²-5y+y²
=3X³-(2-1)X²+(y²-y²)+(5y-5y)
=3X³-X²