7.口算
3-$\frac{3}{4}$= | $\frac{7}{12}$÷14= | $\frac{5}{12}$×$\frac{3}{5}$= | 0÷$\frac{1}{9}$×9= |
$\frac{1}{4}$+$\frac{1}{2}$= | 1÷$\frac{2}{7}$= | $\frac{5}{7}$×$\frac{2}{3}$÷$\frac{5}{7}$= | $\frac{1}{2}$×$\frac{1}{3}$÷$\frac{1}{2}$×$\frac{1}{3}$= |
6.6m的$\frac{1}{7}$和1m的$\frac{6}{7}$相比,( )
A. | 6 m的$\frac{1}{7}$长 | B. | 1m的$\frac{6}{7}$长 | C. | 同样长 |
5.30克盐溶解在300克水中,水和盐水的比是( )
0 159756 159764 159770 159774 159780 159782 159786 159792 159794 159800 159806 159810 159812 159816 159822 159824 159830 159834 159836 159840 159842 159846 159848 159850 159851 159852 159854 159855 159856 159858 159860 159864 159866 159870 159872 159876 159882 159884 159890 159894 159896 159900 159906 159912 159914 159920 159924 159926 159932 159936 159942 159950 199269
A. | 1:11 | B. | 1:10 | C. | 10:1 | D. | 10:11 |