1/(x+1)(x+2)+1/(x+2)(x+3).1/(x+2006)(x+2007)=?
问题描述:
1/(x+1)(x+2)+1/(x+2)(x+3).1/(x+2006)(x+2007)=?
答
1/(x+1)-1/(x+2007)
答
1/(x+1)(x+2)=1/(x+1)-1/(x+2)
以后各项也这样拆开,会了吧