已知二次函数y=3x2+36x+81.
(1)写出它的顶点坐标;
(2)当x取何值时,y随x的增大而增大;
(3)求出图象与x轴的交点坐标;
(4)当x取何值时,y有最小值,并求出最小值;
(5)当x取何值时,y<0.
(1)写出它的顶点坐标;
(2)当x取何值时,y随x的增大而增大;
(3)求出图象与x轴的交点坐标;
(4)当x取何值时,y有最小值,并求出最小值;
(5)当x取何值时,y<0.
更新时间:2018-06-14 00:28:39
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解答题-作图题
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名校
【推荐1】已知二次函数
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(1)利用描点法画出所给函数的图象;
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