9.把3.$\stackrel{•}{8}\stackrel{•}{7}$精确到千分位后,小数记作( )
A. | 3.879 | B. | 3.878 | C. | 3.880 | D. | 3.870 |
8.a÷b<a(a≠0),b和1相比,b一定( )
A. | 比1小 | B. | 等于1 | C. | 比1大 |
4.直接写出得数
0 163632 163640 163646 163650 163656 163658 163662 163668 163670 163676 163682 163686 163688 163692 163698 163700 163706 163710 163712 163716 163718 163722 163724 163726 163727 163728 163730 163731 163732 163734 163736 163740 163742 163746 163748 163752 163758 163760 163766 163770 163772 163776 163782 163788 163790 163796 163800 163802 163808 163812 163818 163826 199269
1÷0.25= | 0.25÷0.1= | 1.2÷1.2= | 4.01×1= |
1-0.55= | 0.25×2= | 0÷2.76= | 7.2÷1.2= |
3.9×0.01= | 9.73÷10= |