2个回答
展开全部
x²-y²-z²-2yz
=x²-(y²御扒+z²局拆顷+2yz)
=x²-(y+z)²桐陆
=(x+y+z)(x-y-z)
=x²-(y²御扒+z²局拆顷+2yz)
=x²-(y+z)²桐陆
=(x+y+z)(x-y-z)
追问
那这一题呢:
a³+b³+c³-3abc
追答
a³+b³+c³-3abc
=a³+3a²b+3ab²+b³+c³-3a²b-3ab²-3abc
=(a+b)³+c³-3a²b-3ab²-3abc
=(a+b+c)(a²+2ab+b²-ac-bc+c²)-3ab(a+b+c)
=(a+b+c)(a²+2ab+b²-ac-bc+c²-3ab)
=(a+b+c)(a²+b²+c²-ab-ac-bc)
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