已知正方形
内接于
,点
为
上一点,连接
、
、
.
(1)如图1,求证:∠DEC+∠BEC= 180°;
(2)如图2,过点C作CF⊥CE交BE于点F,连接AF, M为AE的中点,连接DM并延长交AF于点N,求证: DN⊥AF;
(3)如图3,在(2) 的条件下,连接OM,若AB=10,
求OM的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)如图1,求证:∠DEC+∠BEC= 180°;
(2)如图2,过点C作CF⊥CE交BE于点F,连接AF, M为AE的中点,连接DM并延长交AF于点N,求证: DN⊥AF;
(3)如图3,在(2) 的条件下,连接OM,若AB=10,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4ff09ebc1f8c8956e2f6d7823e5aa5.png)
![](https://img.xkw.com/dksih/QBM/2020/7/5/2499314304147456/2500140829343745/STEM/705aad97-cd82-42dc-a365-d1b08cba277b.png)
更新时间:2020-07-06 17:32:26
|
相似题推荐
解答题-问答题
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【推荐1】如图,抛物线
经过
,
,
三点,顶点为
,连接
、
,抛物线的对称轴为
,
与
轴交点为
,与
交点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/97c6246c-b095-4ee6-853a-fc4507ef019f.png?resizew=148)
(1)求这条抛物线的函数关系式;
(2)在抛物线的对称轴上是否存在一点
,使
,若存在,求出点
的坐标;若不存在,请说明理由.
(3)若点
是平面内一点,抛物线对称轴上,是否存在这样的点
,使得以
,
、
、
为顶点的四边形是矩形?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/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42f05b013e4b7166cbc87c5a83d6a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/97c6246c-b095-4ee6-853a-fc4507ef019f.png?resizew=148)
(1)求这条抛物线的函数关系式;
(2)在抛物线的对称轴上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ab71d2d81fe66a3be8362d5eccd4ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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【推荐2】在矩形ABCD(
)中,点E在边AD上,点F在DC延长线上,连接BE、BF,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985446943399936/2987619507757056/STEM/99bf10ae-d015-408b-9fff-86670047ddc8.png?resizew=504)
(1)如图1,求证,
;
(2)如图2,当E是AD中点时,求证:
;
(3)如图3,在(2)的条件下,过点E作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
交CD于点G,若
,求线段DG的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca70570f2e9a8cc7c0738a3c08b96fc.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985446943399936/2987619507757056/STEM/99bf10ae-d015-408b-9fff-86670047ddc8.png?resizew=504)
(1)如图1,求证,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f29a47c8a4833567f3b8bcbef1cc42.png)
(2)如图2,当E是AD中点时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43047a82af806269b90eb8883af6a38.png)
(3)如图3,在(2)的条件下,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35237bf38fe272d7d0b3b12fa00b902f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476fd0534c09a93e72cc42f17e294ff3.png)
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【推荐1】问题提出:
(1)如图1,正方形ABCD的边长为4,对角线AC,BD交于点O.若点P是对角线BD上任意一点,则线段AP长的取值范围是 _____;
问题探究:
(2)如图2,若点P是△ABC内任意一点,点M,N分别是AB边和对角线AC上的两个动点,则当AP的值在(1)中的取值范围内变化时,△PMN的周长是否存在最小值?若存在,求出△PMN周长的最小值;若不存在,请说明理由;
问题解决:
(3)如图3,正方形ABCD边长为4,点P是△ABC内任意一点,且AP=4,点M,N分别是AB边和对角线AC上的两个动点,则当△PMN的周长取到最小值时,求四边形AMPN面积的最大值.
(1)如图1,正方形ABCD的边长为4,对角线AC,BD交于点O.若点P是对角线BD上任意一点,则线段AP长的取值范围是 _____;
问题探究:
(2)如图2,若点P是△ABC内任意一点,点M,N分别是AB边和对角线AC上的两个动点,则当AP的值在(1)中的取值范围内变化时,△PMN的周长是否存在最小值?若存在,求出△PMN周长的最小值;若不存在,请说明理由;
问题解决:
(3)如图3,正方形ABCD边长为4,点P是△ABC内任意一点,且AP=4,点M,N分别是AB边和对角线AC上的两个动点,则当△PMN的周长取到最小值时,求四边形AMPN面积的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/7b9037b3-ceee-43bc-a6b8-12a39547b99d.png?resizew=520)
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【推荐2】已知抛物线y=ax2+2ax+c与x轴交于A(-3,0),B两点,交y轴于点C(0,-3).
(1)求抛物线的解析式;
(2)如图1,点P在抛物线的对称轴上,P的纵坐标为n,若-3<n<0,以C、P为顶点作正方形CPDE(C、P、D、E顺时针排列),若正方形CPDE有两个顶点在抛物线上,求n的值;
(3)如图2,C、F两点关于对称轴对称,直线y=kx+b(k<0)过点F,且与抛物线有且只有一个交点,平移直线y=kx+b交抛物线于G,H两点(点G在点H上方),请判断∠GCF与∠HCF的数量关系,并说明理由.
(1)求抛物线的解析式;
(2)如图1,点P在抛物线的对称轴上,P的纵坐标为n,若-3<n<0,以C、P为顶点作正方形CPDE(C、P、D、E顺时针排列),若正方形CPDE有两个顶点在抛物线上,求n的值;
(3)如图2,C、F两点关于对称轴对称,直线y=kx+b(k<0)过点F,且与抛物线有且只有一个交点,平移直线y=kx+b交抛物线于G,H两点(点G在点H上方),请判断∠GCF与∠HCF的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733518581194752/2737125290532864/STEM/1183bfba-aaaf-43b3-b765-a88ab9a8d802.png)
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【推荐1】如图1,抛物线y=﹣
与x轴交于A、B(B在A的左侧)两点,与y轴交于点C,将直线AC沿y轴正方向平移2个单位得到直线A′C′,将抛物线的对称轴沿x轴正方向平移
个单位得到直线l.
(1)求直线AC的解析式;
(2)如图2,点P为直线A′C′上方抛物线上一动点,连接PC,PA与直线AC分别交于点E、F,过点P作PP1⊥l于点P1,M是线段AC上一动点,过M作MN⊥A′C′于点N,连接P1M,当△PCA的面积最大时,求P1M+MN+
NA′的最小值;
(3)如图3,连接BC,将△BOC绕点A顺时针旋转60°后得到△B1O1C1,点R是直线l上一点,在直角坐标平面内是否存在一点S,使得以点O1、C1、R、S为顶点的四边形是矩形?若存在,求出点S的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c8f683f8eb32055d956fa840d606297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
(1)求直线AC的解析式;
(2)如图2,点P为直线A′C′上方抛物线上一动点,连接PC,PA与直线AC分别交于点E、F,过点P作PP1⊥l于点P1,M是线段AC上一动点,过M作MN⊥A′C′于点N,连接P1M,当△PCA的面积最大时,求P1M+MN+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
(3)如图3,连接BC,将△BOC绕点A顺时针旋转60°后得到△B1O1C1,点R是直线l上一点,在直角坐标平面内是否存在一点S,使得以点O1、C1、R、S为顶点的四边形是矩形?若存在,求出点S的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/8/2177978293485568/2178530294915072/STEM/9e948064bc1348d693a02c1630e41678.png?resizew=379)
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解题方法
【推荐2】如图1,
是
的直径,弦
,
.
![](https://img.xkw.com/dksih/QBM/2023/6/7/3254470726557696/3255038808956928/STEM/070ae3437bb44791b8a457b70b794ae3.png?resizew=453)
(1)求证:
是等边三角形;
(2)如图2,若点E是
的中点,连接
,过点C作
,垂足为F,若
,求线段
的长;
(3)若
的半径为4,点P是直线
上的动点,将点P绕点O逆时针旋转
得点R,连接
.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d72a007e3c4a134956b0e3fbde5f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://img.xkw.com/dksih/QBM/2023/6/7/3254470726557696/3255038808956928/STEM/070ae3437bb44791b8a457b70b794ae3.png?resizew=453)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,若点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c23e376ab222814e0029d2adb5a957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea37f262f50b2c43b5c5fba506f3f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c79224edfb7613852b59ec2beb21171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fec7c339e3a132e74b858de077a2f3b.png)
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【推荐1】如图1,在正方形ABCD中,
,点O,E在边CD上,且
,
,以点O为圆心,OE为半径在其左侧作半圆O,分别交AD于点G,交CD的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/60c2c9b3-ed60-4d95-b97e-43ad486307de.png?resizew=270)
(1)
____________
(2)如图2,将半圆O绕点E逆时针旋转
,点O的对应点为
,点F的对应点为
,设M为半圆
上一点.
①当点F落在AD边上时,求点M与线段BC之间的最短距离;
②当半圆
交BC于P,R两点时,若
的长为
,求此时半圆
与正方形ABCD重叠部分的面积;
③当半圆
与正方形ABCD的边相切时,设切点为N,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ed04c4ea1abe97c7dd2f3e95dc0eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/60c2c9b3-ed60-4d95-b97e-43ad486307de.png?resizew=270)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c69a9feb14d4b9ccba6ae42837fd73.png)
(2)如图2,将半圆O绕点E逆时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
①当点F落在AD边上时,求点M与线段BC之间的最短距离;
②当半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d1bf4ac9c53a3408b81744ea2cc31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2daf8c9ca3b4a1695c4f47c1bf6c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
③当半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa4371d43264b8d7a3528ab4f4d49a1.png)
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【推荐2】如图①,线段
,
交于点O,连接
和
,若
与
,
与
中有一组内错角成两倍关系,则称
与
为青蓝三角形,其中成两倍关系的内错角中,较大的角称为青蓝角.
(1)如图②,在四边形
中,对角线
,
交于点O,已知
,
为等边三角形.求证:
和
为青蓝三角形.
(2)如图③,已知边长为2的正方形
,点P为边
上一动点(不与点C,D重合),连接
和
,对角线
和
交于点O,当
和
为青蓝三角形时,求
的正切值.
(3)如图④,四边形
内接于
,
和
是青蓝三角形,且
为青蓝角,延长
,
交于点E.
①若
,
,求
的半径;
②记
的面积为
,
的面积为
,
,
,当
时,求y关于x的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4686f39b38d5b90309ee73ed89a0640.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/9/da839daf-eac0-4e6e-9872-c124fced2403.jpg?resizew=334)
(1)如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
(2)如图③,已知边长为2的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea98cd15fa4c868eb83ca260c6d9ae6.png)
(3)如图④,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c562f35d37deaa855e69d6616a6dc801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e266f1f00b25c1fad57a3e3fd179a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aaf31d3dad3de5a3eefd225a76e850d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd3b3822c0e887d6cd6c7f5b3d0eb0bd.png)
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