约分,(x+y)²-z² 分之 x² -(y-z)²
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约分,(x+y)²-z² 分之 x² -(y-z)²
约分,(x+y)²-z² 分之 x² -(y-z)²
约分,(x+y)²-z² 分之 x² -(y-z)²
[x² -(y-z)²]/[(x+y)²-z² ] (用平方差展开)
=[(x+y-z)(x-y+z)]/[(x+y-z)(z+y+z)]
=(x-y+z)]/(x+y+z)