2.直接写出得数
| 8.4+63.6= | 2.2×0.4= | 4.2÷0.7= | 2÷0.04= |
| 1.25×0.8= | 4.8÷48= | 2-0.04= | 0.1÷0.01÷0.001= |
20.整数2和奇数p的最小公倍数是( )
| A. | p | B. | 2p | C. | 2 | D. | 无法判断 |
19.在自然数1至 m中,一共有n个质数,那么还有( )个合数.
0 126888 126896 126902 126906 126912 126914 126918 126924 126926 126932 126938 126942 126944 126948 126954 126956 126962 126966 126968 126972 126974 126978 126980 126982 126983 126984 126986 126987 126988 126990 126992 126996 126998 127002 127004 127008 127014 127016 127022 127026 127028 127032 127038 127044 127046 127052 127056 127058 127064 127068 127074 127082 199269
| A. | m | B. | m-n | C. | m-1 | D. | m-n-1 |