因式分解x²-y²-z²+2yz
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因式分解x²-y²-z²+2yz
因式分解x²-y²-z²+2yz
因式分解x²-y²-z²+2yz
解
x²-y²-z²+2yz
=x²-(y²+z²-2yz)
=x²-(y-z)²
=(x+y-z)(x-y+z)
x²-y²-z²+2yz
=x²-(y²+z²-2yz)
=x²-(y-z)²
=(x-y+z)(x+y-z)