16.在数轴上点A表示的数是-2,点B到点A的距离是4,则点表示是( )
| A. | 6 | B. | -2 | C. | -6 | D. | -6或2 |
14.抛物线y=-5(x-2)2+3的顶点坐标是( )
0 278889 278897 278903 278907 278913 278915 278919 278925 278927 278933 278939 278943 278945 278949 278955 278957 278963 278967 278969 278973 278975 278979 278981 278983 278984 278985 278987 278988 278989 278991 278993 278997 278999 279003 279005 279009 279015 279017 279023 279027 279029 279033 279039 279045 279047 279053 279057 279059 279065 279069 279075 279083 366461
| A. | (2,3) | B. | (-2,3) | C. | (2,-3) | D. | (-2,-3) |