y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标
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![y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标](/uploads/image/z/8260290-18-0.jpg?t=y%3D-2x%26%23178%3B%2B5x%2B8+y%3D-3x%26%23178%3B%2B8x-2+%E5%AF%B9%E7%A7%B0%E8%BD%B4%E3%80%81%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87y%3D-2x%26%23178%3B%2B5x%2B8+y%3D-3x%26%23178%3B%2B8x-2+%E5%AF%B9%E7%A7%B0%E8%BD%B4%E3%80%81%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87)
y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标
y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标
y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标
y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标y=-2x²+5x+8 y=-3x²+8x-2 对称轴、顶点坐标
y=-2(x²-5x/2+25/16-25/16)+8
=-2(x²-5x/2+25/16)+25/8+8
=-2(x-5/4)²+89/8
所以对称轴x=5/4
顶点(5/4,89/8)
同理
y=-3x²+8x-2
=-3(x-4/3)²+10/3
顶点(4/3,10/3),对称轴x=4/3
对称轴分别是直线X=5/4,X=4/3,顶点是(5/4,89/8),(4/3,10/3)