1/12+1/20+1/30+1/40+.+1/110=?

1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=? 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=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110 求1/2+1/6+1/12+20/1+30/1+...1/110 计算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=?用简便运算! 求解小学数学题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=? 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=几分之几 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?