1⼀2+1⼀3+2⼀3+1⼀4+2⼀4+3⼀4+1⼀5+2⼀5+3⼀5+4⼀5+……+1⼀100+2⼀100+……+99⼀100

2024-12-26 02:02:07
推荐回答(2个)
回答1:

1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+……+1/100+2/100+……+99/100
=(1/2)+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+……+(1/100+2/100+……+99/100)
=1/2+2/2+3/2+4/2+....+99/2
=[(1+99)*99/2]/2
=9900/4
=2475

回答2:

恩,太难了,楼上解答不错!