9.
解方程. 60%x=1.2 | 16x-6.4x=36 | $\frac{4}{5}$x+1$\frac{1}{2}$=2$\frac{1}{6}$ | x:5.6=5:3.5. |
8.把4克糖全部溶解在500克水中,糖和糖水重量的比是( )
A. | 4:500 | B. | 14:496 | C. | 4:504 |
7.24个铁圆锥,可以熔铸成与铁圆锥等底等高的圆柱体的个数是( )
0 159796 159804 159810 159814 159820 159822 159826 159832 159834 159840 159846 159850 159852 159856 159862 159864 159870 159874 159876 159880 159882 159886 159888 159890 159891 159892 159894 159895 159896 159898 159900 159904 159906 159910 159912 159916 159922 159924 159930 159934 159936 159940 159946 159952 159954 159960 159964 159966 159972 159976 159982 159990 199269
A. | 12个 | B. | 8个 | C. | 36个 | D. | 72个 |