名校
1 . 某小区要用篱笆围成一直角三角形花坛.花坛的斜边利用足够长的墙,两条直角边所用的篱笆之和恰好为21米.围成的花坛是如图所示的直角
,其中
.设
边的长为
米,直角
的面积为
平方米.
(1)求
与
之间的函数关系式(不要求写出自变量
的取值范围);
(2)根据小区的规划要求,所修建的直角三角形花坛面积是54平方米,问直角三角形的两条直角边的长各为多少米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/21/1a9bd7a9-de14-4d9e-8a39-38fd89615847.png?resizew=199)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据小区的规划要求,所修建的直角三角形花坛面积是54平方米,问直角三角形的两条直角边的长各为多少米?
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2 . 如图,用长为
的铝合金条制成“日”字形矩形窗户,使窗户的透光面积最大,那么这个窗户的最大透光面积是______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/e5ae91c3-e6e5-491f-b904-548b1c3df532.png?resizew=108)
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3 . 已知抛物线
的顶点为
,与y轴的交点为
.
(1)求
的表达式;
(2)若直线
与
仅有唯一的交点,求m的值;
(3)若抛物线
关于y轴对称的抛物线记作
,平行于x轴的直线记作
,试结合图形回答:当n为何值时,
与
和
共有:①两个交点;②三个交点;③四个交点;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12652efb124f262e3cbefaed4962bb58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14fb45f3b5485ae0944808625c59af96.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/efd3ddbb-7d8b-4397-bb67-3e339a4ecd4e.png?resizew=201)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ced9da0d768b765fd76bf58eceb2863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621c65dc9b43d285341bd428bfc5972f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
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2023-08-08更新
|
140次组卷
|
2卷引用:湖南省益阳市南县城西中学2022-2023学年九年级上学期期中数学试题
4 . 如图1,点
,
,a,b满足
,抛物线经过A,B两点,点
关于点B的对称点M刚好落在抛物线上.
(1)求抛物线的解析式;
(2)如图2,点
为第一象限抛物线上一动点,过点
作
轴交直线
于点
,过点
作
交
轴于点
,求
的最大值及此时点
的坐标;
(3)过点
作
平行于
轴交
于点
,若点
为抛物线上的一点,点
在
轴上,连接
,
,
.是否存在点
使得
与
相似?若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c09615735d331befd07664aa47cb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8091be6be83bb02dc1f84f1790fb6626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2f117dc9adcb8fa7acf25bd2cbf283.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/0b114633-a7fb-4590-90d1-689a14ef28d0.png?resizew=232)
(1)求抛物线的解析式;
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20008ade7e23b01f5abdee57fa05a63d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b73db43b2ded725b5ec0fde022b32c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/8ce7be51-045e-4efe-a5c2-623bb6775b24.png?resizew=245)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f8b3d45ae1743416253d835c054456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/0056249c-c909-411b-9898-fd8f48010f9f.png?resizew=234)
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5 . 在美化校园的活动中,某兴趣小组想借助如图所示的直角墙角,用14米长的篱笆围成一个矩形花园
(篱笆只围
、
两边),若
为
米,围成花园的面积为
平方米,则
与
的函数关系式______ .(化成一般形式)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/012cb065-5032-47da-969a-ecbe18f0ac81.png?resizew=130)
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6 . 如图①,在平面直角坐标系中,点O为坐标原点,抛物线
顶点的纵坐标为
,与y轴相交于点A;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/543650f6-38b2-4eb3-9c8d-dc99f62bbd93.png?resizew=493)
(1)求抛物线的解析式;
(2)如图②,经过点A的直线与x轴交于点B,点C在抛物线上,连接
,且
,
,求直线
的解析式;
(3)如图③,在(2)的条件下,P为抛物线上一点,Q为直线
上一点,连接
、
,若
,
,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72d193875879f2e04aa1dd4474b25d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbf80cb71406fd14621139149f7ed9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/543650f6-38b2-4eb3-9c8d-dc99f62bbd93.png?resizew=493)
(1)求抛物线的解析式;
(2)如图②,经过点A的直线与x轴交于点B,点C在抛物线上,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(3)如图③,在(2)的条件下,P为抛物线上一点,Q为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebe520e3ff81c0e49c7ccfdec7dcba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d7f32ad1aa384b193b0263b48225a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c30bbe110896619f822ec7686d992a6.png)
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2023-03-11更新
|
82次组卷
|
2卷引用:黑龙江省哈尔滨市香坊区德强学校初中部2022-2023学年九年级上学期月考数学(五四制)试题
7 . 某校九年级数学兴趣小组在社会实践活动中,进行了如下的专题探究;一定长度的铝合金材料,将它设计成外观为长方形的框,在实际使用中,如果竖档越多,窗框承重就越大,如果窗框面积越大,采光效果就越好.
小组讨论后,同学们做了以下试验:
请根据以上图案回答下列问题:
(1)在图案①中,如果铝合金材料总长度(图中所有黑线的长度和)为
,当
为
,窗框
的面积是______
;
(2)在图案②中,如果铝合金材料总长度为
,试探究
长为多少时,窗框
的面积最大,最大为多少?
(3)经过不断的试验,他们发现:总长度一定时,竖档越多,窗框的最大面积越小,试验证:当总长还是
时,对于图案③的最大面积,图案④不能达到这个面积.
小组讨论后,同学们做了以下试验:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/11/e8410f49-2a32-4b69-9a6e-49452d835957.png?resizew=498)
请根据以上图案回答下列问题:
(1)在图案①中,如果铝合金材料总长度(图中所有黑线的长度和)为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
(2)在图案②中,如果铝合金材料总长度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)经过不断的试验,他们发现:总长度一定时,竖档越多,窗框的最大面积越小,试验证:当总长还是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
您最近一年使用:0次
2023-07-31更新
|
179次组卷
|
3卷引用:安徽省芜湖市无为市第三中学2022-2023学年九年级上学期月考数学试题
安徽省芜湖市无为市第三中学2022-2023学年九年级上学期月考数学试题(已下线)专题05 二次函数的实际应用(5类经典题型+优选提升)-【好题汇编】备战2023-2024学年九年级数学上学期期中真题分类汇编(人教版)陕西省汉中市宁强县2023-2024学年九年级上学期期末数学试题
8 . 如图,四边形
为直角梯形,
,
,矩形(阴影部分)
的一边
在
上,其余两个顶点
、
分别在
、
上.
(1)当
时,矩形
的面积为______ ;
(2)矩形
面积最大时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96cf3f9a01a810792ebacc7f5bc70e97.png)
______ ,最大面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0016a780b64dc21f123dd2a8a6a4d2b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/3f8622b8-bd42-49d3-9c66-aa8fa79a4a13.png?resizew=174)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2bb91b0a9ff9a5d2f4bb0d3687466a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0016a780b64dc21f123dd2a8a6a4d2b3.png)
(2)矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0016a780b64dc21f123dd2a8a6a4d2b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96cf3f9a01a810792ebacc7f5bc70e97.png)
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22-23九年级上·河北唐山·阶段练习
9 . 如图,要利用一面墙(长为
)建羊圈,用100m长的围栏围成两个大小相同的矩形羊圈,每个羊圈留有个
宽的门(留门部分不需要围栏),若宽用x(m)表示,总面积用y(
)表示.
(1)写出总面积y(
)关于宽x(m)的函数关系式:
(2)当面积
时,求羊圈的宽x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1611d15c7e1e4ab4a4a61537b3989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/c774e00d-c496-45a7-966c-901abd43fffc.png?resizew=150)
(1)写出总面积y(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
(2)当面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61cb61477ea2b35eb609f8c1fa48372.png)
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名校
10 . 如图,
和
都是等腰直角三角形,
,
,
是
斜边上的中线,点
是射线
上的一点,以
为斜边向左侧作等腰直角
,连接
.
(1)当点
在线段
上(点
与点
、点
不重合),求证:
;
(2)在(1)的条件下,设
,
的面积为y,求y关于
的函数关系式及其定义域;
(3)探究:当点
在射线
上运动时,
是否可以成为等腰三角形?若可以,求出
的长度;若不可以,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de85e94211f2edb591cb4f7be9e26eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/df4f318a-6c82-4f8a-b96f-186930744566.png?resizew=242)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39832b5afaf002272e3dec2eeae39b0.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1dd8809233c90f66563c34f2164415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)探究:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926b737b11722b88fd40fc8eef8ecba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
2023-07-26更新
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