18．直接写得数
0 157810 157818 157824 157828 157834 157836 157840 157846 157848 157854 157860 157864 157866 157870 157876 157878 157884 157888 157890 157894 157896 157900 157902 157904 157905 157906 157908 157909 157910 157912 157914 157918 157920 157924 157926 157930 157936 157938 157944 157948 157950 157954 157960 157966 157968 157974 157978 157980 157986 157990 157996 158004 199269
| 25×40%= | 0.25×0.12= | 3.6÷25%×4= | 28.4÷0.4= |
| （12.5+$\frac{3}{4}$）×8= | 19-5$\frac{3}{5}$-1$\frac{2}{5}$= | 8+0.1÷0.1-8= | $\frac{4}{9}$÷$\frac{4}{7}$= |