4X^2 Y^2+2XY-X^2-Y^2可因式分解为何?请帮我- -
问题描述:
4X^2 Y^2+2XY-X^2-Y^2可因式分解为何?请帮我- -
答
4X^2 Y^2+2XY-X^2-Y^2
=(2XY)^2-(X-y)^2
=(2XY+X-Y)(2XY-X+y)