0.1+0.2+0.3+0.4+.......+0.9+0.1+0.11+0.12+.......+0.98+0.99等于多少?

2024-11-15 18:56:13
推荐回答(3个)
回答1:

(0.1+0.9)*9/2+(0.10+0.99)90/2
=4.5+1.09*45
=53.55

回答2:

49.5

回答3:

  53.45?