(1/2+1/3...+1/2012)X(1+1/2...+2011)-(1+1/2+...+1/2012)X(1/2+1/3+...+1/2011)

来源：学生作业帮助网编辑：六六作业网时间：2024/07/07 11:27:19

(1/2+1/3...+1/2012)X(1+1/2...+2011)-(1+1/2+...+1/2012)X(1/2+1/3+...+1/2011)(1/2+1/3...+1/2012)X(1+1/

(1/2+1/3...+1/2012)X(1+1/2...+2011)-(1+1/2+...+1/2012)X(1/2+1/3+...+1/2011)
(1/2+1/3...+1/2012)X(1+1/2...+2011)-(1+1/2+...+1/2012)X(1/2+1/3+...+1/2011)

(1/2+1/3...+1/2012)X(1+1/2...+2011)-(1+1/2+...+1/2012)X(1/2+1/3+...+1/2011)
(1/2+1/3...+1/2012)X(1+1/2...+1/2011)-(1+1/2+...+1/2012)X(1/2+1/3+...+1/2011)
=(1/2+1/3...+1/2012)+(1/2+1/3...+1/2012)x(1/2...+1/2011)-(1/2+1/3+...+1/2011)-(1/2+...+1/2012)X(1/2+1/3+...+1/2011)
=1/2012