1 |
2 |
1 |
2 |
b |
2a |
1 |
2 |
A.(0,-4) | B.(-4,0) | C.(0,4) | D.(4,0) |
A.(3,0) | B.(-3,0) | C.(0,3) | D.(0,-3) |
A.(0,3) | B.(-3,0) | C.(0,-3) | D.(4,-3) |
A.开口向下,对称轴为x=-3,顶点坐标为(3,-5) |
B.开口向下,对称轴为x=-3,顶点坐标为(-3,-5) |
C.开口向上,对称轴为x=3,顶点坐标为(-3,5) |
D.开口向上,对称轴为x=-3,顶点坐标为(-3,-5) |
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