9.脱式计算
3.6-2.8+3.4-7.2 | 7.2×[(7.8+$\frac{1}{5}$)÷0.4] | (6.9-3.15)÷0.3×0.8 |
$\frac{17}{23}$×2$\frac{1}{3}$+2$\frac{1}{3}$×$\frac{6}{23}$ | 3.5×2.8+5.5×2.8+2.8 | ($\frac{1}{15}$-$\frac{1}{51}$)×17×5 |
6.脱口而出:
10-0.06= | 10$\frac{1}{11}$×11= | 6÷($\frac{2}{3}$-$\frac{1}{3}$)= | 1.2×$\frac{5}{6}$ |
9+1÷10= | 6+3$\frac{2}{3}$= | $\frac{5}{8}$×$\frac{1}{7}$×$\frac{7}{5}$= | $\frac{5}{6}$×$\frac{5}{18}$÷$\frac{5}{6}$= |
5.A数除以B数,商是0.2,A数与B数的最简整数比是( )
A. | 5:1 | B. | 2:1 | C. | 1:5 | D. | 2:10 |
1.下面的关系式中,成反比例的是第( )个式子.
0 158785 158793 158799 158803 158809 158811 158815 158821 158823 158829 158835 158839 158841 158845 158851 158853 158859 158863 158865 158869 158871 158875 158877 158879 158880 158881 158883 158884 158885 158887 158889 158893 158895 158899 158901 158905 158911 158913 158919 158923 158925 158929 158935 158941 158943 158949 158953 158955 158961 158965 158971 158979 199269
A. | 3-x=y | B. | x-3=y | C. | 3÷x=y | D. | x3=y |