10 15 20 25 … 90怎么算?

2025-06-27 06:38:34
推荐回答(1个)
回答1:

解(10+90)+(15+85)+(20+80)+(25+75)+(30+70)+(35+65)+(40+60)+(45+55)+50
=100x8+50
=800+50
=850