1加2加3加到100用什么符合代替
1 2 3 4 5 6 7 8 9 10 ...... 99 100
=(1 100)x100÷2
=101x50
=5050
1 2 3 4 5 6 7 8 9 10 ...... 99 100
=(1 100)x50
=101x50
=5050
1 2 3 4 5 6 7 8 9 10 ...... 99 100
=(1 99) (2 98) …… (49 51) 50 100
=100x50 50
=5000 50
=5050
注:n(n 1)÷2
答:可以,不过需要一张ARMAX软件光盘详情>>
答:详情>>