计算.3X³-2X²-y²+5y+X²-5y+y²
来源：学生学帮网 编辑：学帮网 时间：2024/07/07 01:41:56
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
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