1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/06 08:03:14

1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?
急用!

1/2+1/6+1/12+1/20+1/30+1/42+……+1/110
=1-1/2+1/2-1/3+1/3-1/4+……+1/10-1/11
=1-1/11
=10/11

计算1/2-1/6-1/12-1/20-1/30-1/42…-1/132. 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=? 1/2+1/6+1/12+1/20+1/30+……+1/90=? 1/6+1/12+1/20+1/30+1/42+……+1/132等于多少 1/2+1/6+1/12+……+1/110 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110 若a=1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132+1/ 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132= 2\1+6\1+12\1+20\1+30\1+42\1+56\1+72\1+90\1+110\1+132\1=? 按规律填空：1/2,1/6,-1/12,1/20,1/30,-1/42,（）,……（）第20个…… 计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?用简便运算!