请问1成2加2乘3加3乘4加4乘5…加49乘50等于多少

2024-11-09 00:14:00
推荐回答(2个)
回答1:

回答2:

=1-1/2+1/2-1/3+⋯+1/49-1/50
=1-1/50
=49/50