(x+y)²-z²分之x²-(y-z)²
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(x+y)²-z²分之x²-(y-z)²
(x+y)²-z²分之x²-(y-z)²
(x+y)²-z²分之x²-(y-z)²
=(x+y-z)(x-y+z)/(x+y+z)(x+y-z)
=(x-y+z)/(x+y+z)
(x+y)²-z²分之x²-(y-z)²
(x+y)²-z²分之x²-(y-z)²
(x+y)²-z²分之x²-(y-z)²
=(x+y-z)(x-y+z)/(x+y+z)(x+y-z)
=(x-y+z)/(x+y+z)