12．直接写出得数．
0 158869 158877 158883 158887 158893 158895 158899 158905 158907 158913 158919 158923 158925 158929 158935 158937 158943 158947 158949 158953 158955 158959 158961 158963 158964 158965 158967 158968 158969 158971 158973 158977 158979 158983 158985 158989 158995 158997 159003 159007 159009 159013 159019 159025 159027 159033 159037 159039 159045 159049 159055 159063 199269
| 451-198= | 12.12÷12= | 0.66+0.44= | 5.125×8= |
| $\frac{1}{3}$-$\frac{1}{5}$= | $\frac{6}{7}$×$\frac{5}{9}$= | 4÷18= | $\frac{1}{3}$×$\frac{1}{4}$÷$\frac{1}{3}$×$\frac{1}{4}$= |
