4.甲班人数比乙班人数少$\frac{1}{5}$,则乙班人数比甲班人数多( )
A. | $\frac{1}{4}$ | B. | $\frac{1}{5}$ | C. | $\frac{4}{5}$ |
3.水结成冰后,体积增加原来的$\frac{1}{9}$,冰化成水后,体帜减小( )
0 161812 161820 161826 161830 161836 161838 161842 161848 161850 161856 161862 161866 161868 161872 161878 161880 161886 161890 161892 161896 161898 161902 161904 161906 161907 161908 161910 161911 161912 161914 161916 161920 161922 161926 161928 161932 161938 161940 161946 161950 161952 161956 161962 161968 161970 161976 161980 161982 161988 161992 161998 162006 199269
A. | $\frac{1}{10}$ | B. | $\frac{1}{11}$ | C. | $\frac{1}{12}$ |