因式分解x²-y²-z²=2yz+2x+1x²-y²-z²=2yz+2x+1因式分解
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因式分解x²-y²-z²=2yz+2x+1x²-y²-z²=2yz+2x+1因式分解因式分解x²-y²-z²=
因式分解x²-y²-z²=2yz+2x+1x²-y²-z²=2yz+2x+1因式分解
因式分解x²-y²-z²=2yz+2x+1
x²-y²-z²=2yz+2x+1因式分解
因式分解x²-y²-z²=2yz+2x+1x²-y²-z²=2yz+2x+1因式分解
=其实是+
原式=(x²+2x+1)-(y²-2yz+z²)
=(x+1)²-(y-z)²
=(x+y-z+1)(x-y+z+1)