2.下列各数中,互为相反数的是( )
| A. | |-$\frac{3}{2}$|和-$\frac{3}{2}$ | B. | |-$\frac{2}{3}$|和-$\frac{3}{2}$ | C. | |-$\frac{2}{3}$|和$\frac{3}{2}$ | D. | |-$\frac{2}{3}$|和$\frac{2}{3}$ |
1.M点在数轴上表示4,N点离M的距离是3,那么N点表示( )
| A. | 1? | B. | 7? | C. | 1或7? | D. | 1或1 |
20.下列各数:-5,2,-3,1,$\frac{1}{2}$中,正整数有( )
| A. | 1个 | B. | 2个 | C. | 3个 | D. | 4个 |
19.0不是( )
| A. | 负数 | B. | 自然数 | C. | 整数 | D. | 有理数 |
18.下列说法不正确的是( )
| A. | 1是整数 | B. | 2是自然数 | C. | 5是正数 | D. | $\frac{1}{2}$是负数 |
14.下列运算结果等于1的是( )
0 309781 309789 309795 309799 309805 309807 309811 309817 309819 309825 309831 309835 309837 309841 309847 309849 309855 309859 309861 309865 309867 309871 309873 309875 309876 309877 309879 309880 309881 309883 309885 309889 309891 309895 309897 309901 309907 309909 309915 309919 309921 309925 309931 309937 309939 309945 309949 309951 309957 309961 309967 309975 366461
| A. | (-1)+(-1) | B. | (-1)-(-1) | C. | (-2)×(-2) | D. | (-3)÷(-3) |