试确定y=1/4x²+x+1的对称轴和顶点坐标.
人气：349 ℃ 时间：2020-09-06 07:04:55
解答
y=(1/4)x²+x+1
=(1/4)(x²+4x+4)
=(1/4)(x+2)²
对称轴x=-2
顶点坐标(-2,0).
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