(1)y=-(1/3)x²,开口向下,对称轴是y轴,顶点坐标是(0,0);
(2)y=-(1/3)x²+2,开口向下,对称轴是y轴,顶点坐标是(0,2);
(3)y=(-1/3)x²-2,开口向下,对称轴是y轴,顶点坐标是(0,-2).
(4)y=(-1/3)x²+4,开口向下,对称轴是y轴,顶点坐标是(0,4)
图像略.
(1)y=-(1/3)x²,开口向下,对称轴是y轴,顶点坐标是(0,0);
(2)y=-(1/3)x²+2,开口向下,对称轴是y轴,顶点坐标是(0,2);
(3)y=(-1/3)x²-2,开口向下,对称轴是y轴,顶点坐标是(0,-2).
(4)y=(-1/3)x²+4,开口向下,对称轴是y轴,顶点坐标是(0,4)
图像略.