因式分解x²-y²-z²+2yz

因式分解x²-y²-z²+2yz
因式分解x²-y²-z²+2yz

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

因式分解
x²-y²-z²+2yz
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
如果不懂，请追问，祝学习愉快！