约分:x²+y²-9-2xy/x²-y²+6x+9
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![约分:x²+y²-9-2xy/x²-y²+6x+9](/uploads/image/z/4523295-39-5.jpg?t=%E7%BA%A6%E5%88%86%EF%BC%9Ax%26%23178%3B%2By%26%23178%3B-9-2xy%2Fx%26%23178%3B-y%26%23178%3B%2B6x%2B9)
约分:x²+y²-9-2xy/x²-y²+6x+9
约分:x²+y²-9-2xy/x²-y²+6x+9
约分:x²+y²-9-2xy/x²-y²+6x+9
【x²+y²-9-2xy】/【x²-y²+6x+9】
=【(x²-2xy+y²)-9】/【(x²+6x+9)-y²】
=【(x-y)²-9】/【(x+3)²-y²】
=【(x-y+3)(x-y-3)】/【(x+3+y)(x+3-y)】
=【(x-y+3)(x-y-3)】/【(x+3+y)(x-y+3)】
=(x-y-3)/(x+3+y)