14.把下列的假分数化成整数或带分数.
| $\frac{9}{2}$= | $\frac{39}{14}$= | $\frac{32}{8}$= | $\frac{37}{6}$= |
13.把2米长的木条锯成3段,锯一段的时间是锯完总时间的( )
0 140742 140750 140756 140760 140766 140768 140772 140778 140780 140786 140792 140796 140798 140802 140808 140810 140816 140820 140822 140826 140828 140832 140834 140836 140837 140838 140840 140841 140842 140844 140846 140850 140852 140856 140858 140862 140868 140870 140876 140880 140882 140886 140892 140898 140900 140906 140910 140912 140918 140922 140928 140936 199269
| A. | $\frac{1}{2}$ | B. | $\frac{1}{3}$ | C. | $\frac{1}{4}$ |