1 |
2 |
1 |
2 |
A.y=(x+3)2+2 | B.y=(x-3)2+2 | C.y=(x+3)2-2 | D.y=(x-3)2-2 |
A.a>0,开口向上;对称轴是直线x=h;顶点坐标是(h,k) |
B.a<0,开口向下;对称轴是直线x=h;顶点坐标是(h,k) |
C.a>0,开口向上;a<0,开口向下;对称轴是直线x=h;顶点坐标是(h,k) |
D.a<0,开口向上;a<0,开口向下;对称轴是直线x=ah;顶点坐标是(ah,k) |
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