4．直接写出得数．
| 25×0.2= | 10-0.86= | 24×$\frac{3}{4}$= |
| 125%×8= | 4.8÷0.8= | 8÷$\frac{4}{5}$= |
| 12×（$\frac{1}{4}$+$\frac{1}{6}$）= | $\frac{2}{3}$-$\frac{2}{3}$×0= | 2.5×3.5×0.4= |
3．2013年的1月份、2月份、3月份一共有（ ）天．
| A． | 89 | B． | 90 | C． | 91 | D． | 92 |
17．直接写得数．
0 159809 159817 159823 159827 159833 159835 159839 159845 159847 159853 159859 159863 159865 159869 159875 159877 159883 159887 159889 159893 159895 159899 159901 159903 159904 159905 159907 159908 159909 159911 159913 159917 159919 159923 159925 159929 159935 159937 159943 159947 159949 159953 159959 159965 159967 159973 159977 159979 159985 159989 159995 160003 199269
| $\frac{1}{3}$×1= | $\frac{1}{4}$×$\frac{2}{5}$= | $\frac{5}{6}$×18= | $\frac{7}{12}$×$\frac{3}{14}$= | 15×$\frac{3}{5}$= |
| 0.18×$\frac{7}{18}$= | $\frac{2}{3}$×$\frac{9}{10}$= | $\frac{4}{25}$×100= | 1.2×$\frac{1}{6}$= | $\frac{4}{11}$×$\frac{11}{4}$= |