(x-y)²/(x²-y²)约分要过程

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(x-y)²/(x²-y²)约分要过程(x-y)²/(x²-y²)约分要过程(x-y)²/(x²-y²)约分要

(x-y)²/(x²-y²)约分要过程
(x-y)²/(x²-y²)约分要过程

(x-y)²/(x²-y²)约分要过程
(x-y)²/(x²-y²)
=(x-y)²/(x+y)(x-y)
=(x-y)/(x+y)