2-4+6-8+10-12…-48+50

2-4+6-8+10-12…-48+50
2025-01-24 03:38:10
推荐回答(1个)
回答1:

2-4+6-8+10-12…-48+50
=2+(6-4)+(10-8)+……+(50-48)
=2+2×24
=50