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：2024/05/09 04:07:50
![2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]](/uploads/image/z/1333294-70-4.jpg?t=2%28x%26%23178%3B-xy%29-3%282x%26%23178%3B-3xy%29-2%5BX%26%23178%3B-%282x%26%23178%3B-xy%2By%26%23178%3B%29%5D)
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
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来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 04:07:50
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