8．直接写出计算结果．
| $3-\frac{2}{5}$= | $1÷\frac{3}{8}$= | $\frac{3}{7}×\frac{2}{9}$= | $\frac{1}{3}+\frac{3}{5}$= |
| $\frac{5}{12}×\frac{4}{5}$= | 28×35%= | 0.7÷0.7= | $\frac{5}{6}×24$= |
7．下面叙述正确的是（ ）
0 154818 154826 154832 154836 154842 154844 154848 154854 154856 154862 154868 154872 154874 154878 154884 154886 154892 154896 154898 154902 154904 154908 154910 154912 154913 154914 154916 154917 154918 154920 154922 154926 154928 154932 154934 154938 154944 154946 154952 154956 154958 154962 154968 154974 154976 154982 154986 154988 154994 154998 155004 155012 199269
| A． | 角的边越长，角越大 | |
| B． | 一个数的因数一定小于这个数的倍数 | |
| C． | 9.89595…用四舍五入法保留两位小数是9.90 |