3 |
4 |
3 |
2 |
9 |
4 |
3 |
4 |
3 |
2 |
9 |
4 |
3 |
4 |
3 |
2 |
9 |
4 |
3 |
4 |
3 |
2 |
9 |
4 |
3 |
4 |
9 |
4 |
3 |
4 |
9 |
4 |
3 |
4 |
3 |
4 |
9 |
4 |
A.开口向下,对称轴为直线x=-2,顶点坐标为(2,9) |
B.开口向下,对称轴为直线x=2,顶点坐标为(2,9) |
C.开口向上,对称轴为直线x=-2,顶点坐标为(-2,9) |
D.开口向上,对称轴为直线x=-2,顶点坐标为(-2,-9) |
1 |
2 |
A.(1,0) | B.(1,1) | C.(-1,0) | D.(-1,1) |
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