16．
| 求未知数x． x÷219=32 | 5034-x=2840 | 3620÷x=181 |
| 328×x=9840 | 4200÷x=70 | x÷36=78． |
13．
0 161775 161783 161789 161793 161799 161801 161805 161811 161813 161819 161825 161829 161831 161835 161841 161843 161849 161853 161855 161859 161861 161865 161867 161869 161870 161871 161873 161874 161875 161877 161879 161883 161885 161889 161891 161895 161901 161903 161909 161913 161915 161919 161925 161931 161933 161939 161943 161945 161951 161955 161961 161969 199269
| 直接写出得数． 3800÷200= | 7500÷500= | 9600÷1600= | 7200÷300= |
| 8400÷400= | 3600÷1800= | 4200÷600= | 5400÷1800= |
| 7200÷800= | 9100÷700= | 7700÷1100= |