观察下列各式:(a-1)(a+1)=a^2-1;(a-1)(a^2+a+1)=a^3-1; (a-1)(a^3+a^2+a+1)=a^4-1
观察下列各式:(a-1)(a+1)=a^2-1;(a-1)(a^2+a+1)=a^3-1;(a-1)(a^3+a^2+a+1)=a^4-1...请根据上式规律写出:(1)...
观察下列各式:
(a-1)(a+1)=a^2-1;
(a-1)(a^2+a+1)=a^3-1;
(a-1)(a^3+a^2+a+1)=a^4-1
...
请根据上式规律写出:
(1)(a-1)(a^n+a^n-1+...+a+1)=______;
(2)计算:2^2013+2^2012+2^2011+...+2+1. 展开
(a-1)(a+1)=a^2-1;
(a-1)(a^2+a+1)=a^3-1;
(a-1)(a^3+a^2+a+1)=a^4-1
...
请根据上式规律写出:
(1)(a-1)(a^n+a^n-1+...+a+1)=______;
(2)计算:2^2013+2^2012+2^2011+...+2+1. 展开
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