15．用简便方法计算．
| ①5.5×8.2+1.8×5.5 | ②0.25×0.89×4 | ③4.5×98 |
| ④4.8÷2.5÷4 | ⑤8.8×1.25 | ⑥12.5×1.36×0.8 |
| ⑦32.6×1.01-0.01×3.26 | ⑧1.25×0.45×0.8 | ⑨0.38×102 |
13．直接写出得数．
0 164772 164780 164786 164790 164796 164798 164802 164808 164810 164816 164822 164826 164828 164832 164838 164840 164846 164850 164852 164856 164858 164862 164864 164866 164867 164868 164870 164871 164872 164874 164876 164880 164882 164886 164888 164892 164898 164900 164906 164910 164912 164916 164922 164928 164930 164936 164940 164942 164948 164952 164958 164966 199269
| 18×0.01= | 0.32×5= | 3.2÷0.1= | 0.27÷0.03= |
| 80×0.3= | 2.3×20= | 0.01÷0.1= | 6.5×10= |
| 0×0.995= | 1.8÷0.3= | 0÷4.61= | 1.25×8= |
| 10÷2.5= | 2.4×5= | 0.37×0.4= | 2.34×0.2= |
