7.脱式计算.(你认为怎样简便就怎样算)
| 12.5×3.2×2.5 | 2.45×99+2.45 | 4.6×2.3-0.3×4.6 |
| 1.01×99+1.01 | 0.8×630×0.125 | 1.5×1.2 |
6.0.5里面有( )个0.01.
| A. | 500 | B. | 50 | C. | 5 | D. | 0.5 |
5.用四舍五入法得到一个数的近似值是9.0,这个数是( )
| A. | 9.94 | B. | 9.05 | C. | 9.049 | D. | 8.43 |
4.0.044×0.85的积是( )
0 132721 132729 132735 132739 132745 132747 132751 132757 132759 132765 132771 132775 132777 132781 132787 132789 132795 132799 132801 132805 132807 132811 132813 132815 132816 132817 132819 132820 132821 132823 132825 132829 132831 132835 132837 132841 132847 132849 132855 132859 132861 132865 132871 132877 132879 132885 132889 132891 132897 132901 132907 132915 199269
| A. | 3.74 | B. | 0.374 | C. | 0.0374 |