如图,在△ABC中,∠C=90º,AC=6cm,BC=8cm,D、E分别是AC、AB的中点,连接DE.点P从点D出发,沿DE方向匀速运动,速度为1cm/s;同时,点Q从点B出发,沿BA方向匀速运动,速度为2cm/s,当点P停止运动时,点Q也停止运动.连接PQ,设运动时间为t(0<t<4)s.解答下列问题:
![](https://img.xkw.com/dksih/QBM/2012/8/10/1573484168151040/1573484202057728/STEM/dc7f2038bf4e4500af65a3353169dd1e.png?resizew=350)
(1)当t为何值时,PQ⊥AB?
(2)当点Q在B、E之间运动时,设五边形PQBCD的面积为ycm2,求y与t之间的函数关系式;
(3)在(2)的情况下,是否存在某一时刻t,使得PQ分四边形BCDE所成的两部分的面积之比为S△PQE:S五边形PQBCD=1:29?若存在,求出此时t的值以及点E到PQ的距离h;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2012/8/10/1573484168151040/1573484202057728/STEM/dc7f2038bf4e4500af65a3353169dd1e.png?resizew=350)
(1)当t为何值时,PQ⊥AB?
(2)当点Q在B、E之间运动时,设五边形PQBCD的面积为ycm2,求y与t之间的函数关系式;
(3)在(2)的情况下,是否存在某一时刻t,使得PQ分四边形BCDE所成的两部分的面积之比为S△PQE:S五边形PQBCD=1:29?若存在,求出此时t的值以及点E到PQ的距离h;若不存在,请说明理由.
2012·山东青岛·中考真题 查看更多[1]
(已下线)2012年初中毕业升学考试(山东青岛卷)数学
更新时间:2016-12-05 12:04:42
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解答题-证明题
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【推荐1】如图,
的直径
,点
是
延长线上的一点,且
,
是
的中点,
交
于一点
,
是
上的一动点(不与点
,
重合),连接
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/10/7/2566068063682560/2566808240799744/STEM/1ae3f257686746ea95f4321dcaf5182d.png?resizew=200)
(1)求证:
是
的切线
(2)求
的值;
(3)运动过程中,当
,设此时
交
于点
,连接
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8d56fceb5212a7febf587dd79eba65.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(2)求
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(3)运动过程中,当
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解题方法
【推荐2】如图,在平面直角坐标系xOy中,直线
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(1)求线段BC的长(用含t的代数式表示);
(2)求S关于t的函数解析式,并直接写出自变量t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
(1)求线段BC的长(用含t的代数式表示);
(2)求S关于t的函数解析式,并直接写出自变量t的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/8af70b16-5fb0-44f3-8769-f13886bf8017.png?resizew=236)
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【推荐3】如图,菱形ABCD中,已知∠BAD=120°,∠EGF=60°, ∠EGF的顶点G在菱形对角线AC上运动,角的两边分别交边BC、CD于E、F.
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(1)如图甲,当顶点G运动到与点A重合时,求证:EC+CF=BC;
(2)知识探究:
①如图乙,当顶点G运动到AC的中点时,请直接写出线段EC、CF与BC的数量关系(不需要写出证明过程);
②如图丙,在顶点G运动的过程中,若
,探究线段EC、CF与BC的数量关系;
(3)问题解决:如图丙,已知菱形的边长为8,BG=7,CF=
,当
>2时,求EC的长度.
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(1)如图甲,当顶点G运动到与点A重合时,求证:EC+CF=BC;
(2)知识探究:
①如图乙,当顶点G运动到AC的中点时,请直接写出线段EC、CF与BC的数量关系(不需要写出证明过程);
②如图丙,在顶点G运动的过程中,若
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真题
【推荐1】如图,已知二次函数
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(2)连接
、
,若点N在线段
上运动(不与点B、C重合),过点N作
,交
于点M,当
面积最大时,求N点的坐标;
(3)连接
,在(2)的结论下,求
与
的数量关系.
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(1)求二次函数
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(2)连接
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(3)连接
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解题方法
【推荐2】在平面直角坐标系中,抛物线
交x轴于A、B两点(点A在点B的左),交y轴于点C
![](https://img.xkw.com/dksih/QBM/2022/2/26/2924547902128128/2931688339283968/STEM/e5a7eada-c8aa-4cdb-b416-94cdb4e29172.png?resizew=612)
(1)当
时,
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(1)当
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