19．用竖式计算．
| 654+103 | 742+536 | 73÷9 |
| 900-726 | 886-576 | 760-183 |
18．直接写出得数．
0 159662 159670 159676 159680 159686 159688 159692 159698 159700 159706 159712 159716 159718 159722 159728 159730 159736 159740 159742 159746 159748 159752 159754 159756 159757 159758 159760 159761 159762 159764 159766 159770 159772 159776 159778 159782 159788 159790 159796 159800 159802 159806 159812 159818 159820 159826 159830 159832 159838 159842 159848 159856 199269
| 300-70= | 14÷2= | 380-30= | 42+28= | 800-500= |
| 250-60= | 39+72= | 30÷4= | 26+57= | 200+180= |