[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 12:27:52
![[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)](/uploads/image/z/7258421-29-1.jpg?t=%5B%EF%BC%88X%2BY%29%26%23178%3B-%28X-Y%29%26%23178%3B-4X%26%23178%3BY%26%23178%3B%5D%2F%282XY%29)
[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
[(X+Y)²-(X-Y)²-4X²Y²]/(2XY)
=[(X+Y-X+Y)(X+Y+X-Y)-4X²Y²]/(2XY)
=[4XY-4X²Y²]/(2XY)
=4XY[1-XY]/(2XY)
=2[1-XY]
=2-2XY