皮带10元一条广告录音:6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103

1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8) 网球比分6-7(4)/6-7(11)/6-2/6-1/7-6(3)中的括号的数字怎么理解 6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103 1/5×1/6+1/6×1/7+1/7×1/8+1/8×1/9+1/9×1/10的简便方法是什么？ 1/2+1/3+1/4+1/5+1/6+1/7+.......+1/99+1/100=？ 1/2+1/3+1/4+1/5+1/6+1/7+...+1/n 1/2+3/4+5/6+7/8+9/10+``````+99/100=? 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 (x+1/x+2)-(1/x+7)=(x+2/x+3)-(1/x+6)