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数学
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化简(x²+xy+y²)(x²-xy+y²)=?
人气:375 ℃ 时间:2019-12-08 13:34:08
解答
(x²+xy+y²)(x²-xy+y²)=[(x²+y²)+xy][(x²+y²)-xy]
=(x²+y²)²-(xy)²
=x^4+2x²y²+y^4-x²y²
=x^4+x²y²+y^4
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