7.0敏锐贼pvp 控制到死:2/3,1,6/5,4/3,() ;5,17,21,25,() 麻烦写下具体思路 答对都追加:)

1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8) 71 1/6×6/7+61 1/5×5/6+51 1/4×4/5+41 1/3×3/4+31 1/2×3/2 1 8 9 4 1 1/6的排列规律、0 3/2 2/3 5/4 4/5 7/6 1/2+1/3+1/4+1/5+1/6+1/7+.......+1/99+1/100=？ 1+1/2-1/3+1/4-1/5+1/6+.....-1/n +1/(n+1) 1-1/2+1/3-1/4+1/5-1/6+1/7.............-1/50=? 1/2+1/3+1/4+1/5+1/6+1/7+...+1/n 1/2-1/3+1/4-1/5+1/6-.....-1/99+1/100的公式是什么? 1/2+3/4+5/6+7/8+9/10+``````+99/100=? 按规律填下去，1/3，-2/6，3/9，-4/18，5/36，