如图,已知抛物线y=ax2﹣5ax+2(a≠0)与y轴交于点C,与x轴交于点A(1,0)和点B.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1574236425535488/1574236431302656/STEM/8b41f179d0c84fbf8e5413bf52b144f0.png)
(1)求抛物线的解析式;
(2)求直线BC的解析式;
(3)若点N是抛物线上的动点,且点N在第四象限内,过点N作NH⊥x轴,垂足为H,以B,N,H为顶点的三角形是否能够与△OBC相似?若能,请求出所有符合条件点N的坐标;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1574236425535488/1574236431302656/STEM/8b41f179d0c84fbf8e5413bf52b144f0.png)
(1)求抛物线的解析式;
(2)求直线BC的解析式;
(3)若点N是抛物线上的动点,且点N在第四象限内,过点N作NH⊥x轴,垂足为H,以B,N,H为顶点的三角形是否能够与△OBC相似?若能,请求出所有符合条件点N的坐标;若不能,请说明理由.
更新时间:2016-12-06 13:35:07
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【推荐1】如图,在正方形
中,
,
是对角线
上的点,连接
,过点
作
交
于点
,连接
交
于点
.
(1)求证:
;
(2)求证:
;
(3)若
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的长.
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(1)求证:
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(2)求证:
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(3)若
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【推荐2】已知
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的直径,
为
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,
,在
的延长线上取一点
,连接
,使
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(1)如图1,若
,求证:
是
的切线;
(2)如图2,延长
交
于点
,连接
.
①若
的直径为
,
,求
的长;
②若
,求
的值.
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(2)如图2,延长
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①若
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②若
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【推荐3】已知菱形ABCD的边长为2.∠ADC=60°,等边△AEF两边分别交边DC、CB于点E、F.
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(1)特殊发现:如图①,若点E、F分别是边DC、CB的中点.求证:菱形ABCD对角线AC、BD交点O即为等边△AEF的外心;
(2)若点E、F始终分别在边DC、CB上移动.记等边△AEF的外心为点P.
①猜想验证:如图②.猜想△AEF的外心P落在哪一直线上,并加以证明;
②拓展运用:如图③,当△AEF面积最小时,过点P任作一直线分别交边DA于点M,交边DC的延长线于点N,试判断
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②拓展运用:如图③,当△AEF面积最小时,过点P任作一直线分别交边DA于点M,交边DC的延长线于点N,试判断
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【推荐1】如图,在平面直角坐标系
中,直线
与
轴、
轴分别交于点
和点
,抛物线
经过点
,且与直线
的另一个交点为
.
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(1)求
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是抛物线上位于
之间的一动点(不与点
重合),设点
的横坐标为
当
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的面积最大,并求出其最大值;
(3)在
轴上是否存在点
,使以点
为顶点的三角形与∆
相似?若存在,直接写出点
的坐标(不用说理);若不存在,请说明理由.
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(3)在
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【推荐2】抛物线
与x轴交于A、B两点(点A在点B左侧),且
,
,抛物线的顶点为点D.
(1)求抛物线的解析式;
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,是否存在这样的点P,使得以点P、A、M为项点的三角形与
相似,若存在,求点P的坐标;若不存在,请说明理由.
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(1)求抛物线的解析式;
(2)点P为抛物线上的动点,且位于第一象限,过点P作y轴的平行线交x轴于点M,连接
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