你的题目写错了吧 ?
1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=1+1/2 + 1/2 -1/3 +1/3 -1/4 +1/4 -1/5 +1/5 -1/6 +1/6-1/7+1/7-1/8 +1/8-1/9
=1+1-1/9
= 17/9
如题,答案已经给出.嘻嘻
1+1/2+1/6+1/12+1/20+1/30+1/42+1/52+1/72=?
1个回答
相关问题
-
1／2 + 1／6 + 1／12 + 1／20 + 1／30+ 1／42 + 1／56 + 1／72＝
-
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
-
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
-
6/1+12/1+20/1+30/1+42/1+56/1+72/1=?
-
1/6+1/12+1/20+1/30+1/42+1/56+1/72
-
2\1-6\1-12\1-20\1-30\1-42\1-56\1-72\1-90\1
-
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
-
2/1＋6/1＋12/1＋20/1＋30/1＋42/1＋56/1＋72/1＋90/1
-
1.计算：1 - 1／2 - 1／6- 1／12 - 1／20 - 1／30 - 1／42 - 1／56 - 1／72
-
(1)2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1