1/3+1/6+1/10+1/15+1/21+1/21+1/28=?

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/06 07:39:14

1/3+1/6+1/10+1/15+1/21+1/21+1/28=?
要简单.
详细.
要快。

1/3+1/6+1/10+1/15+1/21+1/21+1/28
=1/3+(1/2-1/3)+(1/6-1/15)+1/15+(1/12-1/28)+1/21+1/28
=1/2+1/6+1/12+1/21
=3/4+1/21
=67/84

1/3 + 1/6 + 1/10 + 1/15 + 1/21 + 1/28 + 1/36 + 1/45 + 1/55=? 裂项法,1,1\3+1\6+1\10+1\15+1\21+1\28+1\36+1\45=?2,1\3+1\15+1\35 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66 1\3+1\6+1\10+1\15+1\21+1\28+1\36+1\45+1\50+1\55 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/50+1/55=? 小六计算题1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55=?如果把他都改成-号 1／3+1／6+1／10+1／15+1／21+1／28+1／36+1／45这个数学题?算 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45只要这个小学列项法3/1+6/1+10/1+15/1+21/1+28/1+36/1+45/1 3/1+6/1+10/1+15/1+21/1+28/1+36/1+45/1等于多少? 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45简便算法! 1\3+1\6+1\10+1\15+1\21+1\28+1\36+1\45+1\55+1\66+1\78+1\91+1\