y=-½x²-3x+二分之七
=-½（x²+6x)+7/2
=-½(x²+6x+9)+7/2-9/2
=-(x+3)²-1
对称轴是直线x=-3
顶点坐标(-3,-1)
求抛物线y=-½x²-3x+二分之七的对称轴和顶点坐标
求抛物线y=-½x²-3x+二分之七的对称轴和顶点坐标
数学人气：928 ℃时间：2019-10-09 06:23:58
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