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计算题①﹙a+1﹚²﹙a-1﹚² ②2009²-2008×2010
①﹙a+1﹚²﹙a-1﹚²
②2009²-2008×2010
人气:353 ℃ 时间:2020-04-07 16:01:32
解答
①﹙a+1﹚²﹙a-1﹚²
=[(a+1)(a-1)]²
=(a²-1)²
=a^4-2a²+1
②2009²-2008×2010
=2009²-(2009-1)×(2009+1)
=2009²-(2009²-1)
=2009²-2009²+1
=1
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