计算题①﹙a+1﹚²﹙a-1﹚² ②2009²-2008×2010①﹙a+1﹚²﹙a-1﹚²②2009²-2008×2010

计算题①﹙a+1﹚²﹙a-1﹚² ②2009²-2008×2010①﹙a+1﹚²﹙a-1﹚²②2009²-2008×2010
计算题①﹙a+1﹚²﹙a-1﹚² ②2009²-2008×2010
①﹙a+1﹚²﹙a-1﹚²
②2009²-2008×2010

计算题①﹙a+1﹚²﹙a-1﹚² ②2009²-2008×2010①﹙a+1﹚²﹙a-1﹚²②2009²-2008×2010
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

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
=1

①=（a+1)(a-1)(a+1)(a-1)
=（a²-1）（a²-1)
=a四次方-2a²+1
②=2009²-（2009-1）×（2009+1）
=2009²-（2009²-1）
=1