告诉偶啊...
參考答案:将X-Y+(4XY/X-Y)通分得到 (x+y)^2 /(x-y)
将X+Y-(4XY/X+Y)通分得到 (x-y)^2 /(x+y)
则原式
=[(x+y)^2 /(x-y)][(x-y)^2 /(x+y)]
=(x+y)(x-y)
=x^2 -y^2
告诉偶啊...
參考答案:将X-Y+(4XY/X-Y)通分得到 (x+y)^2 /(x-y)
将X+Y-(4XY/X+Y)通分得到 (x-y)^2 /(x+y)
则原式
=[(x+y)^2 /(x-y)][(x-y)^2 /(x+y)]
=(x+y)(x-y)
=x^2 -y^2