1-1/2-1/6-1/12-1/20-.-1/9900

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+...+1/9702+1/9900 2/1+6/1+12/1+20/1+30/1+42/1+.+9900/1 1/6+1/12+20/1+...+1/9900 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? 1/2+1/6+1/12+1/20+1/30+.+1/9900=? 1/2+1/6+1/12+1/20……1/9702+1/9900=? 谁知道 2/1+6/1+12/1+20/1+30/1+…+9900/1 等于多少? 1/2+1/6+1/12+1/20+1/30+...+1/9900怎么算 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+.1/9900