9999.9+9999.8+9999.7……+9999.1=?

问题描述:

9999.9+9999.8+9999.7……+9999.1=?

9999.9+9999.8+9999.7……+9999.1
=9999×10 +(0.9+0.8+0.7……+0.1)
= 99990+ 4.5
= 99994.5