6.
0 159727 159735 159741 159745 159751 159753 159757 159763 159765 159771 159777 159781 159783 159787 159793 159795 159801 159805 159807 159811 159813 159817 159819 159821 159822 159823 159825 159826 159827 159829 159831 159835 159837 159841 159843 159847 159853 159855 159861 159865 159867 159871 159877 159883 159885 159891 159895 159897 159903 159907 159913 159921 199269
口算. 240÷4 | 400÷5 | 640÷4 | 160÷8 |
40×10 | 11×80 | 22+69 | 0÷6 |
30×15 | 14×20 | 60×80 | 240÷8. |