【概念认识】城市的许多街道是相互垂直或平行的,因此往往不能沿直线行走到目的地,只能按直角拐弯的方式行走.我们可以按照街道的垂直和平行方向建立平面直角坐标系
,对两点
和
,用以下方式定义两点间的“折线距离”:
.
【数学理解】
(1)①已知点
,则
___________;
②函数
的图象如图(1),
是图象上一点,若
,则点
的坐标为________;
(2)函数
的图象如图(2),该函数图象上是否存在点
,使
?若存在,求出其坐标;若不存在,请说明理由;
【拓展运用】
(3)函数
的图象如图(3),
是图象上一点,求
的最小值及对应的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c913b3abbf53d81fcf25bf83d4ae3756.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/0b901988-b22b-45bc-8a4b-30de6901d3d6.png?resizew=547)
【数学理解】
(1)①已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7078a4e8e927c163c7f98e66759c9834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3371dc8908efc42c6868ce2b08eb0e31.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4bccf3e722b902bec9cb8f9dceb3061.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938d900ae1069cf13b3122874006d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0528a32307ca9a437400120aab4d81a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6baee21a2a13a91b198824b9d1e66c3e.png)
【拓展运用】
(3)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c152ead56bb5e35c9e4bff03286be90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c477707bef7fd447e4d1d903ee699409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
更新时间:2023-05-27 12:44:17
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相似题推荐
解答题-问答题
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【推荐1】已知关于
的一元二次方程
.
(1)若该一元二次方程有实数解,求
的取值范围;并试从
,
,
三个数中,选取一个数作为
的值,求该方程的解;
(2)当
时,原方程有一根为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd8d84fe43436b311b39a9da30fe527.png)
(1)若该一元二次方程有实数解,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b9a5f1362c12e1ea8f6fc0d9d787ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda4a339bf659e7e88756e2f228f4c78.png)
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【推荐2】如图,已知在矩形
中,
,点
是线段
边上的任意一点(不含端点
),连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/2c62aa1a-676b-4afd-b746-9b2564e7b42a.png?resizew=212)
(1)若
,求
.
(2)若
,当
时,求出此时
的长.
(3)设
,试探索点
在线段
上运动过程中,使得
与
相似时,求
应满足什么条件,并求出此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2dc503f8828e2035549b09312e284c0.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/80934ff67b4ceeaa13b00c029db565dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed3797a759dca7272c4f8a2434423ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/2c62aa1a-676b-4afd-b746-9b2564e7b42a.png?resizew=212)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa38841987317e374ca552caae355502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5e78338c598859511fa64e21a8e294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c30f73c718bde8352055a14987fc15.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/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】在平面直角坐标系中,已知点
,
,
,直线
经过点
,抛物线
恰好经过
,
,
三点中的两点.
(1)判断点
是否在直线
上,并说明理由;
(2)求
的值;
(3)平移抛物线
,
①使其顶点为
,求此时抛物线与
轴交点的坐标;
②使其顶点仍在直线
上,求平移后所得抛物线与
轴交点纵坐标的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1f1caceb5040487888386ed75c5658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d8e0c27cda4d7d62e3c1f667c5cb1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68fb97fd5909cf52391aca5bdb8e51e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d00a5df9d281dd4e1e45bf6a4d6fb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2503abd9bdd50084d2ae821fd1d9a633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15bd315b801f71bc30b8d772098614.png)
(3)平移抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
①使其顶点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②使其顶点仍在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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【推荐2】疫情期间,某口罩公司生产A、B两种类型医用口罩.一家超市4月份向该公司订购了1500件A型口罩和1500件B型口罩,一共花了5700元;5月份又花5600元订购了2000件A型口罩和1000件B型口罩.
(1)求该公司A、B两种类型医用口罩的单价.
(2)6月份,该超市决定只卖A型口罩.经调查发现,当销售单价定为2元时,每天可售出100件,销售单价每涨价0.1元,每天销售量减少10件.设每天销售量为y件,销售单价为x元(
).
①求y与x的函数关系式.
②该超市决定每销售一件口罩便向某慈善机构捐赠a元(
).当销售单价为多少元时,当月获得的利润最大?最大利润为多少元?
(1)求该公司A、B两种类型医用口罩的单价.
(2)6月份,该超市决定只卖A型口罩.经调查发现,当销售单价定为2元时,每天可售出100件,销售单价每涨价0.1元,每天销售量减少10件.设每天销售量为y件,销售单价为x元(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a3fd4d375a5df7d5f072c3b845b66d.png)
①求y与x的函数关系式.
②该超市决定每销售一件口罩便向某慈善机构捐赠a元(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf30ec8905ca7099754c2799a27df32.png)
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解答题-证明题
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【推荐1】已知抛物线
.
(1)求证:该抛物线与x轴总有交点;
(2)若抛物线与x轴交于A、B两点,且
,对于该抛物线上的任意两点
,
,当
时,总有
.
①求该抛物线的函数解析式;
②若直线
与抛物线交于P,Q两点(P,Q都不与A,B重合),直线
,
分别与y轴交于点M,N,设M,N两点的纵坐标分别为m,n,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5616b0c4c0c0f7866019e54a3d3d47.png)
(1)求证:该抛物线与x轴总有交点;
(2)若抛物线与x轴交于A、B两点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c78725ba67079b81943d23759854841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
①求该抛物线的函数解析式;
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de8be7875996edfa84f22f0436e1dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
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【推荐2】在平面直角坐标系中,抛物线
经过点
,
.
(1)求这个二次函数的表达式.
(2)当
时,设二次函数
的最大值与最小值的差为
,求
与
之间的函数关系式.
(3)在坐标平面内,动点
在直线
上,当
为直角三角形且恰好存在两个点
时,求
的取值或取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6bbbb53aaeab0ab7a242228cc510fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549f5e607ed8f8812cd9d40b693074fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/46c79e65-4398-4d43-be41-a7dad25157df.png?resizew=148)
(1)求这个二次函数的表达式.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae71c78e10ad76e10dacc58cbbe145f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在坐标平面内,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1be7302f2e9ff02fee3fcf26e77b1c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐3】已知抛物线C1:y=x2﹣4x+3m和C2:y=mx2﹣4mx+3m,其中m≠0且m≠1.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424532045824/2926966975938560/STEM/56565a5a-743d-4848-8eef-05825337f475.png?resizew=271)
(1)抛物线C1的对称轴是 ,抛物线C2的对称轴是 ;
(2)这两条抛物线相交于点E,F(点E在点F的左侧),求E、F两点的坐标(用含m的代数式表示)并直接写出直线EF与x轴的位置关系;
(3)设抛物线C1的顶点为M,C2的顶点为N;
①当m为何值时,点M与点N关于直线EF对称?
②是否存在实数m,使得MN=2EF?若存在,直接写出实数m的值,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424532045824/2926966975938560/STEM/56565a5a-743d-4848-8eef-05825337f475.png?resizew=271)
(1)抛物线C1的对称轴是 ,抛物线C2的对称轴是 ;
(2)这两条抛物线相交于点E,F(点E在点F的左侧),求E、F两点的坐标(用含m的代数式表示)并直接写出直线EF与x轴的位置关系;
(3)设抛物线C1的顶点为M,C2的顶点为N;
①当m为何值时,点M与点N关于直线EF对称?
②是否存在实数m,使得MN=2EF?若存在,直接写出实数m的值,若不存在,请说明理由.
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【推荐1】一次函数
和反比例函数
的图象的相交于
,
,与x轴交于点C,连接OA,OB.
(1)请直接写出m的值为______,反比例函数
的表达式为____________;
(2)利用(1)中的数值求
的面积;
(3)观察图象,请直接写出
的解集______;
(4)点P在x的正半轴上,当
为等腰三角形时,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c143e0781facdd4e4b6db9854e0ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb79a1b0c6dc78e6de17de6bed477fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b2cc0d2f6d3eee9a33db83e0c0830d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df2d6dedfc510f4c3259925d4ac5994.png)
(1)请直接写出m的值为______,反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb79a1b0c6dc78e6de17de6bed477fb1.png)
(2)利用(1)中的数值求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(3)观察图象,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88de2dfd4cd7eadb82d6868a949bf8c0.png)
(4)点P在x的正半轴上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d0151288363337e743d5796b952473.png)
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【推荐2】如图,在平面直角坐标系
中,一次函数
的图象与反比例函数
的图象相交于
两点,与
轴相交于点
,连接
,且
的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/8e4240a6-441e-4b6a-927a-a7f7f36ea930.png?resizew=171)
(1)求这个反比例函数的表达式;
(2)根据图象写出使一次函数值大于反比例函数值的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8652faaf1560a7914b30fe8c3d7a7c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f787a90a3e8605c711763924ac98c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/8e4240a6-441e-4b6a-927a-a7f7f36ea930.png?resizew=171)
(1)求这个反比例函数的表达式;
(2)根据图象写出使一次函数值大于反比例函数值的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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