数学因式分解计算题[(-x+y)/ (x²-y²)] - [(-x-y)/ (x+y)²]

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数学因式分解计算题[(-x+y)/(x²-y²)]-[(-x-y)/(x+y)²]数学因式分解计算题[(-x+y)/(x²-y²)]-[(-x-y)/

数学因式分解计算题[(-x+y)/ (x²-y²)] - [(-x-y)/ (x+y)²]
数学因式分解计算题
[(-x+y)/ (x²-y²)] - [(-x-y)/ (x+y)²]

数学因式分解计算题[(-x+y)/ (x²-y²)] - [(-x-y)/ (x+y)²]
[(-x+y)/ (x²-y²)] - [(-x-y)/ (x+y)²]
=[-(x-y)/ (x+y)(x-y)] - [-(x+y)/ (x+y)²]
=[-1/ (x+y)] + [1/ (x+y)]
0

等于0