把自然数从1开始连乘,即1×2×3×4×5×…要使乘积的末尾有20个连续的0,则最少要乘到 .
:160=18÷ = %= =0.45.
1: ==25%
=8: = %
36: =0.75== ÷40= 折.
0.375=== :64= %