1/2+1/6+1/12...+1/96+1/110+1/1
1/2加1/6加1/12.加1/90加1/110加1/132等于多少?
1/2+1/6+1/12+……+1/110
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+190+1/110=?
1/2+1/6+1/12+1/24+1/48+1/96=?简便计算
计算 2/3+1/6+1/12+1/24+1/48+1/96+1/192
求1/2+1/6+1/12+20/1+30/1+...1/110
1-3+2-6+3-9+4-12...+31-93+32-96+33-99=?
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*4+1/4*6+1/6*8+1/8*10+1/10*12.+1/2010*2012
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