1/2*3+1/3*4+.....1/9*10=1/2-1/3+1/3-1/4+1/4-1/5......+1/9-1/10=1/2-1/10=2/5
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
4个回答
相关问题
-
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
-
1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
-
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
-
1/2+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
-
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
-
简算：1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
-
简算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+90/1