=(1+0.99+0.98+……+0.5)/100=[(1+0.5)×51÷2]/100=0.3825
1/100+0.99/100+...+0.5/100=(1+0.99+0.98+....+0.5)/100=(0.5+1)(51/50)/100=76.5/5000=765/50000=153/10000=0.0153
7081.722EXCEL中输入公式=SUMPRODUCT(100/(ROW(50:100)/100))