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