1/2+1/6+1/12+.1/90+1/110+1/132=?
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=?
2\1+6\1+12\1+20\1+30\1+42\1+56\1+72\1+90\1+110\1+132\1+156\1
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132
1/2加1/6加1/12.加1/90加1/110加1/132等于多少?
2\1+6\1+12\1+30\1+42\1+56\1+72\1+90\1+110\1= (提示:2\1=1-2\1.6
1/42+1/56+1/72+1/90+1/110+1/132=?
42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?
简算(要有过程)(1)1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132(2)
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132=