1、(a^2+1)^2-4a^2
=a^4+2a²+1-4a²
=a^4-2a²+1
2. x(尘答x+1)-(x+1)(简兄塌x-1)拦圆
=(x+1)[x-(x-1)]
=(x+1)×1
=x+1
=2012+1
=2013
(睁薯袜a^2+1)^2-4a^2
=(a^2+1-2a)(a^2+1+2a)
=(a^2-2a+1)(a^2+2a+1)
=(a-1)^2(a+1)^2
x(悉激x+1)手判-(x+1)(x-1)
=(x+1)(x-(x-1))
=(x+1)(x-x+1)
=x+1
=2012+1
=2013
1 (凳链扮枣灶a^2+1)^2-4a^2=a^4+2a^2+1-4a^2=a^4-2a^2+1=(a^2-1)^2
2 x(x+1)唤猜-(x+1)(x-1)=(x+1)(x-(x-1))=(x+1)=2013
1.平方差公式
[(a+1)(a-1)]^2
2.(x+1)
2013
1. 化简后结果是 (a^2-1)^2
2. 化简后结果是x 1=2013。