作业帮[（X+Y)²-(X-Y)²-4X²Y²]/(2XY)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/03 01:18:15
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[（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