1.( )加上548得1000.
| A. | 351 | B. | 452 | C. | 361 |
20.( )比355多198.
| A. | 78 | B. | 474 | C. | 553 | D. | 464 |
19.养殖场养了120只公鸡,母鸡比公鸡少40只,母鸡养了多少只?正确算式是( )
| A. | 120-40 | B. | 120-40+120 | C. | (120-40)÷2 |
17.下面的比中,( )是最简整数比.
| A. | 13:52 | B. | 2.3:5 | C. | 15:49 |
16.n是非0的自然数,下面算式中得数最大的是( )
0 140848 140856 140862 140866 140872 140874 140878 140884 140886 140892 140898 140902 140904 140908 140914 140916 140922 140926 140928 140932 140934 140938 140940 140942 140943 140944 140946 140947 140948 140950 140952 140956 140958 140962 140964 140968 140974 140976 140982 140986 140988 140992 140998 141004 141006 141012 141016 141018 141024 141028 141034 141042 199269
| A. | n×$\frac{2}{3}$ | B. | $\frac{2}{3}$÷n | C. | n÷$\frac{2}{3}$ |