作业帮3(x²-2y-xy)-[3x²-2y-2(xy+y)],其中x=-1/2,y=-3
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/26 05:53:02
![3(x²-2y-xy)-[3x²-2y-2(xy+y)],其中x=-1/2,y=-3](/uploads/image/z/1163139-51-9.jpg?t=3%28x%26%23178%3B-2y-xy%29-%5B3x%26%23178%3B-2y-2%28xy%2By%29%5D%2C%E5%85%B6%E4%B8%ADx%3D-1%2F2%2Cy%3D-3)
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3(x²-2y-xy)-[3x²-2y-2(xy+y)],其中x=-1/2,y=-3
3(x²-2y-xy)-[3x²-2y-2(xy+y)],其中x=-1/2,y=-3
3(x²-2y-xy)-[3x²-2y-2(xy+y)],其中x=-1/2,y=-3
3(x²-2y-xy)-[3x²-2y-2(xy+y)]
=3x²-6y-3xy-(3x²-2y-2xy-2y)
=3x²-6y-3xy-3xy+4y+2xy
=-y-xy
=3-1/2x3
=3-1.5
=1.5