1减1/6加1/42加1/56加1/72加1/90加1/110用简便运算

问题描述:

1减1/6加1/42加1/56加1/72加1/90加1/110用简便运算

1减1/6加1/42加1/56加1/72加1/90加1/110用简便运算
=1-1/6+(1/6-1/7+1/7-1/8+...+1/10-1/11)
=1-1/11
=10/11;
如果本题有什么不明白可以追问,