计算(2x+y+z)(2x-y-z),
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计算(2x+y+z)(2x-y-z),计算(2x+y+z)(2x-y-z),计算(2x+y+z)(2x-y-z),(2x+y+z)(2x-y-z)=（（2x+(y+z))(2x-(y+z))=4x&#
计算(2x+y+z)(2x-y-z),
计算(2x+y+z)(2x-y-z),
计算(2x+y+z)(2x-y-z),
(2x+y+z)(2x-y-z)
=（（2x+(y+z))(2x-(y+z))
=4x²-（y+z)²
=4x²-y²-2yz-z²
原式=[2x+（y+z）][2x-(y+z)]
=4x²-(y+z)²=4x²-y²-z²-2yz
平方差公式
(2x+y+z)(2x-y-z)
=(2x+y+z)[2x-(y+z)]
=(2x)^2-(y+z)^2
=4x^2-(y^2+2yz+z^2)
=4x^2-y^2-2yz-z^2
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