约分x^2-(y-z)^2/(x+y)^2-z^2

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约分x^2-(y-z)^2/(x+y)^2-z^2约分x^2-(y-z)^2/(x+y)^2-z^2约分x^2-(y-z)^2/(x+y)^2-z^2难.

约分x^2-(y-z)^2/(x+y)^2-z^2
约分x^2-(y-z)^2/(x+y)^2-z^2

约分x^2-(y-z)^2/(x+y)^2-z^2
难.