20.下面各题怎样算简便就怎样算.
34×5+412÷4 | 40.5×201-40.5 | $\frac{11}{15}$×($\frac{5}{14}$+$\frac{5}{21}$)+$\frac{2}{3}$ |
$\frac{7}{11}$+$\frac{3}{5}$÷$\frac{3}{5}$+$\frac{7}{11}$ | ($\frac{4}{5}$-$\frac{1}{2}$÷$\frac{5}{4}$)÷$\frac{14}{25}$ | $\frac{16}{21}$÷[$\frac{1}{2}$×($\frac{6}{5}$-$\frac{3}{10}$)] |
19.直接写出得数.
0 158847 158855 158861 158865 158871 158873 158877 158883 158885 158891 158897 158901 158903 158907 158913 158915 158921 158925 158927 158931 158933 158937 158939 158941 158942 158943 158945 158946 158947 158949 158951 158955 158957 158961 158963 158967 158973 158975 158981 158985 158987 158991 158997 159003 159005 159011 159015 159017 159023 159027 159033 159041 199269
13.5+15= | 7.23÷0.1= | 1-$\frac{3}{8}$= | $\frac{4}{5}$÷$\frac{1}{8}$= | 2÷$\frac{2}{5}$×5= |
3.6÷0.12= | 48×$\frac{3}{4}$= | $\frac{4}{5}$×$\frac{3}{8}$= | $\frac{8}{9}$-$\frac{2}{9}$= | 16×$\frac{4}{7}$÷16×$\frac{4}{7}$= |