已知抛物线y=-2分之一x²+(5-m)x+m-3的对称轴是y求抛物线顶点的坐标
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已知抛物线y=-2分之一x²+(5-m)x+m-3的对称轴是y求抛物线顶点的坐标
![已知抛物线y=-2分之一x²+(5-m)x+m-3的对称轴是y求抛物线顶点的坐标](/uploads/image/z/18795844-28-4.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-2%E5%88%86%E4%B9%8B%E4%B8%80x%26%23178%3B%2B%EF%BC%885-m%EF%BC%89x%2Bm-3%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E6%98%AFy%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%A1%B6%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87)
y= - 0.5x^2+(5-m)x+(m-3) 对称轴:x=0
y= -0.5 [ x^2 - 2(5-m)x ] +(m-3)
y= -0.5 [ x^2 - 2(5-m)x + (5-m)^2 - (5-m)^2 ] + (m-3)
y= -0.5 [ x - (5-m) ]^2 + 0.5(5-m)^2 + (m-3)
y= -0.5 [ x - (5-m) ]^2 + 0.5m^2 - 4m + 9.5
对称轴 x = 5-m = 0 m = 5
顶点坐标(0,0.5m^2 - 4m + 9.5 ) = (0,2)
y= -0.5 [ x^2 - 2(5-m)x ] +(m-3)
y= -0.5 [ x^2 - 2(5-m)x + (5-m)^2 - (5-m)^2 ] + (m-3)
y= -0.5 [ x - (5-m) ]^2 + 0.5(5-m)^2 + (m-3)
y= -0.5 [ x - (5-m) ]^2 + 0.5m^2 - 4m + 9.5
对称轴 x = 5-m = 0 m = 5
顶点坐标(0,0.5m^2 - 4m + 9.5 ) = (0,2)
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