作业帮4xy-[(x²+5xy-y²)-(x²+3xy-2y²)],其中x=2,y=-1求值与化简
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 07:19:52
![4xy-[(x²+5xy-y²)-(x²+3xy-2y²)],其中x=2,y=-1求值与化简](/uploads/image/z/4347554-50-4.jpg?t=4xy-%5B%28x%26%23178%3B%2B5xy-y%26%23178%3B%29-%28x%26%23178%3B%2B3xy-2y%26%23178%3B%29%5D%2C%E5%85%B6%E4%B8%ADx%3D2%2Cy%3D-1%E6%B1%82%E5%80%BC%E4%B8%8E%E5%8C%96%E7%AE%80)
4xy-[(x²+5xy-y²)-(x²+3xy-2y²)],其中x=2,y=-1求值与化简
4xy-[(x²+5xy-y²)-(x²+3xy-2y²)],其中x=2,y=-1求值与化简
4xy-[(x²+5xy-y²)-(x²+3xy-2y²)],其中x=2,y=-1求值与化简
4xy-[(x²+5xy-y²)-(x²+3xy-2y²)]
=4xy-x²-5xy+y²+x²+3xy-2y²
=2xy-y²
=-2x1-(-1)²
=-2-1
=-3