0.13+0.23+0.33+…+0.93.
问题描述:
0.13+0.23+0.33+…+0.93.
答
0.13+0.23+0.33+…+0.93,
=(1+2+3+…+9)2×
,1 1000
=2025×
,1 1000
=2.025.