如图,已知抛物线
与
轴的一个交点
.
![](https://img.xkw.com/dksih/QBM/2018/12/16/2098174917918720/2099596150800384/STEM/7f7ab47875974328a78b598c013f1257.png?resizew=152)
(1)试分别求出这条抛物线与
轴的另一个交点
及与
轴的交点
的坐标.
(2)设抛物线的顶点为
,请在图中画出抛物线的草图,若点
在直线
上,试判断
点是否在经过
点的反比例函数的图象上,并说明理由;
(3)试求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f8954eb56988bafe6a70de8c9b8165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027828f0f8ac91acb30deee1b2ae1c62.png)
![](https://img.xkw.com/dksih/QBM/2018/12/16/2098174917918720/2099596150800384/STEM/7f7ab47875974328a78b598c013f1257.png?resizew=152)
(1)试分别求出这条抛物线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设抛物线的顶点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2a6d18b0cabf7fbdec0788f7d25f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e881a744fa13626596507040912dcd3.png)
更新时间:2018-12-18 19:42:12
|
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【推荐1】如图,
内接于
,
,它的外角
的平分线交
于点D,连接DB,DC,DB交AC于点F.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712420110073856/2713889585078272/STEM/15a10cea-91b8-40d3-988a-d2333e268c49.png?resizew=222)
(1)求证:
.
(2)若
,
①当
,求
的度数(用含
的代数式表示).
②设
的半径为5,
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd7faed4f2efd4055b3145d860bdbb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724f30bf8bcc60c8bc2a0342bab6c3fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712420110073856/2713889585078272/STEM/15a10cea-91b8-40d3-988a-d2333e268c49.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953b7b5c647641edbec4c2ab90a65f4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3cd8fbcd9eb594adb8367795d444d8.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
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【推荐2】已知Rt△ABC,两直角边AB与AC之和为4,作△ABC的外接圆,点O为圆心.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/8dfd3ae7-af00-4f44-91ca-afed97e1e1d4.png?resizew=730)
(1)如图1,连接OA,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
90°时,求OA的值.
(2)如图2,过点A作AD⊥BC于点D,点E为AC中点,连接DE,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
2∠ADE.
(3)如图3,作∠BAC的平分线交BC于点F,线段AF是否存在最大值?若存在,请求出AF的最大值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/8dfd3ae7-af00-4f44-91ca-afed97e1e1d4.png?resizew=730)
(1)如图1,连接OA,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f5ad9cc23a56d42746a29e34033831.png)
(2)如图2,过点A作AD⊥BC于点D,点E为AC中点,连接DE,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f5ad9cc23a56d42746a29e34033831.png)
(3)如图3,作∠BAC的平分线交BC于点F,线段AF是否存在最大值?若存在,请求出AF的最大值;若不存在,请说明理由.
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名校
【推荐3】如图1,在矩形ABCD中,AB=6cm,BC=8cm,E、F分别是AB、BD的中点,连接EF,点P从点E出发,沿EF方向匀速运动,速度为1cm/s,同时,点Q从点D出发,沿DB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:
(1)求证:△BEF∽△DCB;
(2)当点Q在线段DF上运动时,若△PQF的面积为0.6cm2,求t的值;
(3)如图2过点Q作QG⊥AB,垂足为G,当t为何值时,四边形EPQG为矩形,请说明理由;
(4)当t为何值时,△PQF为等腰三角形?试说明理由.
(1)求证:△BEF∽△DCB;
(2)当点Q在线段DF上运动时,若△PQF的面积为0.6cm2,求t的值;
(3)如图2过点Q作QG⊥AB,垂足为G,当t为何值时,四边形EPQG为矩形,请说明理由;
(4)当t为何值时,△PQF为等腰三角形?试说明理由.
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926639368036352/1927459114213376/STEM/61b9ebbdf4f343949045ebda9c6ee234.png?resizew=475)
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【推荐1】综合与实践
问题情境:
在“综合与实践”课上,老师提出如下问题:将正方形
与正方形
按图1所示的方式摆放,其中
,试求
的长.
数学思考:
(1)请你解答老师提出的问题.
深入探究:
(2)老师将图1中的正方形
绕点
逆时针方向旋转,并让同学们提出新的问题.
①“善思小组”提出问题:如图2,当点
落在边
上时,连接
、
,延长
与
交于点
,求
的长.请你解答此问题.
②“智慧小组”提出问题:如图3,连接
、
,线段
与
交于点
,当点
在直线
左侧时,连接
,若存在实数
满足等式
,求出
的值.请你思考此问题,直接写出结果.
问题情境:
在“综合与实践”课上,老师提出如下问题:将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ff9a4f0f16c4bce711d5d4e6c5d086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/965aa79c-cc9d-427f-81b3-3bcab091aadc.png?resizew=462)
数学思考:
(1)请你解答老师提出的问题.
深入探究:
(2)老师将图1中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①“善思小组”提出问题:如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
②“智慧小组”提出问题:如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698a6c69ff0837bd3dddadffed6d7a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】矩形
中,
,
,
是边
上的点,且
,
是直线
上的一点,连接
、
、
.
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725202855026688/2726598501892096/STEM/07d56d7a-7cab-4ef1-b2b3-7becebca1d16.png?resizew=605)
(1)如图1,若
,求
的长;
(2)如图2,将
沿
折叠至点
落在
上,
与
交于点
,求
的长;
(3)如图3,若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725202855026688/2726598501892096/STEM/07d56d7a-7cab-4ef1-b2b3-7becebca1d16.png?resizew=605)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad71b099808015d0e4c420e9e1aa02f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83910639ac9ea98d4980fd0820178d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c257ce10c4e9865eccab41a76e4ce6a4.png)
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【推荐3】如图,在平面直角坐标系中,直线AB与x轴,y轴分别相交于点B,点A,点A坐标为(0,3),点B坐标为(4,0),动点P从点B出发以每秒1个单位长度的速度沿B→A匀速运动,到A点停止运动.过点P作PC⊥x轴,垂足为点C,连接OP.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844508550397952/2846965350113280/STEM/3b3fcc91-ed2e-4350-8a1c-6ce30000baf5.png)
(1)求直线AB的表达式;
(2)当CP=CO时,求点P的横坐标;
(3)当S△OAP=S△OBP时,直接写出点P的坐标;
(4)动点P从点B出发的同时,另一点Q从点A出发以同样的速度沿A→O→B匀速运动.当点P到达点A时,P、Q同时停止运动,设运动时间为t秒,当以B、P、Q为顶点的三角形是等腰三角形时,直接写出此时的t值.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844508550397952/2846965350113280/STEM/3b3fcc91-ed2e-4350-8a1c-6ce30000baf5.png)
(1)求直线AB的表达式;
(2)当CP=CO时,求点P的横坐标;
(3)当S△OAP=S△OBP时,直接写出点P的坐标;
(4)动点P从点B出发的同时,另一点Q从点A出发以同样的速度沿A→O→B匀速运动.当点P到达点A时,P、Q同时停止运动,设运动时间为t秒,当以B、P、Q为顶点的三角形是等腰三角形时,直接写出此时的t值.
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【推荐1】在平面直角坐标系xOy中,已知抛物线y1=x2﹣4x+4的顶点D,直线y2=kx﹣2k(k≠0);
(1)点D是否在直线y2=kx﹣2k上?请说明理由;
(2)过x轴上一点M(t,0)(0≤t≤2)作x轴上的垂线,分别交为y1、y2于点P、点Q.小明同学借助图象性质探究,当k满足什么条件时,存在实数t使得PQ=3,他发现以下结论:
①当k>0时,存在满足条件的t;
②当﹣2<k<﹣0.5时,不存在满足条件的t.
你认为小明的判断是否正确?请说明理由.
(1)点D是否在直线y2=kx﹣2k上?请说明理由;
(2)过x轴上一点M(t,0)(0≤t≤2)作x轴上的垂线,分别交为y1、y2于点P、点Q.小明同学借助图象性质探究,当k满足什么条件时,存在实数t使得PQ=3,他发现以下结论:
①当k>0时,存在满足条件的t;
②当﹣2<k<﹣0.5时,不存在满足条件的t.
你认为小明的判断是否正确?请说明理由.
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【推荐2】已知:抛物线C1:
经过点(2,
),抛物线C2:
.
(1)求
的值;
(2)如图1,直线
(
)分别交第一象限内的抛物线C2,C1于M,N两点.求证:MO=MN.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://img.xkw.com/dksih/QBM/2017/10/28/1804840406351872/1807854125727744/STEM/7f91a2877d064178b75e7fc44859223c.png?resizew=244)
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