约分:x²-y²/(x-y)²
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约分:x²-y²/(x-y)²
约分:x²-y²/(x-y)²
约分:x²-y²/(x-y)²
x²-y²/(x-y)²
=(x+y)(x-y)/(x-y)²
=(x+y)/(x-y)
约分:x²-y²/(x-y)²
约分:x²-y²/(x-y)²
约分:x²-y²/(x-y)²
x²-y²/(x-y)²
=(x+y)(x-y)/(x-y)²
=(x+y)/(x-y)