1/(1*3)+1/(3*5)``````1/(99*101)
1/(1*3)+1/(3*5)``````1/(99*101)
日期:2022-03-29 12:50:48 人气:1
分解2=3-1=5-3=7-5=…=101-99
所以 1/1*3+1/3*5+1/5*7+…+1/99*101
=1/2(2/1*3+2/3*5++…+2/99*101)
=1/2(1-1/3+1/3-1/5+1/5-1/7+...+1/99-1
所以 1/1*3+1/3*5+1/5*7+…+1/99*101
=1/2(2/1*3+2/3*5++…+2/99*101)
=1/2(1-1/3+1/3-1/5+1/5-1/7+...+1/99-1