化简x²-xy+2yz-4z²

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化简x²-xy+2yz-4z²化简x²-xy+2yz-4z²化简x²-xy+2yz-4z²=(x+2z)(x-2z)-y(x-2z)=(x+

化简x²-xy+2yz-4z²
化简x²-xy+2yz-4z²

化简x²-xy+2yz-4z²
=(x+2z)(x-2z)-y(x-2z)
=(x+2z-y)(x-2z)