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
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110 急!
2\1+6\1+12\1+20\1+30\1+42\1+56\1+72\1+90\1+110\1+132\1+156\1
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+190+1/110=?
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=?
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 简便方法
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+.1/9900
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/10
谁能巧算1-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90