作业帮2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/06 04:23:23
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2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
=2x²-2xy-6x²+9xy-2x²+4x²-2xy+2y²
=-2x²+5xy+2y²