dl dt dd和ul li:1/11+1/12+1/13+…1/19=？小学奥数哦！帮我想想在小弟弟前丢脸了！

1/11+1/12+1/13+1/14+1/15 -1/10-1/11-1/11-1/12-…-1/19-1/20 比较大小：1/11+1/29 1/12+1/25 1/13+1/21 1/14+1/19 1/x(x-1)+1/x(x+1)+1/(x+1)(x+20........+1/(x+9)(x+10)=11/12 数字推理 1/根号5，1/3根号7，1/12，1/7根号11 7/12=1/？+1/？+1/？ 1/√5 1/3√7 1/12 1/7√11 1/11√13的排列规律 齐齐算 1/(10/1+12/1) 一:1／8＝1/( )+1/( )二:1/10=1/( )+1/( )三:1/12=1/( )+1/( )+1/( ) 1/2+1/6+1/12+1/20+1/30