1-1/2-1/6-1/12-1/20-...-1/9900=0
1/2+1/6+1/12+1/20+.+1/9900
1/2+1/6+1/12+1\20+1/30+1/42+.+1/9900=?
1/2+1/6+1/12+1/20+1/30+.+1/9900=?
1/2+1/6+1/12+1/20……1/9702+1/9900=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+.1/9900=?
2/1+6/1+12/1+20/1.+9900/1=?简便计算 急
1/2+1/6+1/12+1/20+1/30+...+1/9702+1/9900
2/1+6/1+12/1+20/1+30/1+42/1+.+9900/1
1/6+1/12+20/1+...+1/9900
如果1/6=1/2-1/3,1/12=1/3-1/4那么1/6+1/12+1/20+.+1/9900结果是多少?
1-1/2-1/6-1/12-1/20-.-1/9900
1/2+1/6+1/12+1/20+1/30+……+1/9900 是多少?