16.$\sqrt{2}$的倒数是( )
| A. | $\sqrt{2}$ | B. | $\frac{\sqrt{2}}{2}$ | C. | -$\sqrt{2}$ | D. | -$\frac{\sqrt{2}}{2}$ |
12.-1的绝对值是( )
| A. | -1 | B. | 1 | C. | 0 | D. | ±1 |
11.已知A(x1,y1)和B(x2,y2)是函数y=$\frac{{k}^{2}+1}{x}$图象上两点,当x1<x2时,y1与y2之间的大小关系是( )
0 282859 282867 282873 282877 282883 282885 282889 282895 282897 282903 282909 282913 282915 282919 282925 282927 282933 282937 282939 282943 282945 282949 282951 282953 282954 282955 282957 282958 282959 282961 282963 282967 282969 282973 282975 282979 282985 282987 282993 282997 282999 283003 283009 283015 283017 283023 283027 283029 283035 283039 283045 283053 366461
| A. | y1<y2 | B. | y1=y2 | C. | y1>y2 | D. | 不能确定 |