12．直接写出得数．
0 159680 159688 159694 159698 159704 159706 159710 159716 159718 159724 159730 159734 159736 159740 159746 159748 159754 159758 159760 159764 159766 159770 159772 159774 159775 159776 159778 159779 159780 159782 159784 159788 159790 159794 159796 159800 159806 159808 159814 159818 159820 159824 159830 159836 159838 159844 159848 159850 159856 159860 159866 159874 199269
| $\frac{5}{12}$×$\frac{4}{15}$= | $\frac{5}{7}$÷$\frac{7}{5}$= | $\frac{14}{15}$-$\frac{4}{5}$= | $\frac{2}{7}$×3= |
| $\frac{7}{15}$÷7= | $\frac{5}{12}$×$\frac{6}{15}$×0= | $\frac{5}{2}$×$\frac{2}{5}$= | $\frac{5}{6}$+$\frac{2}{3}$= |