如图,抛物线
与x轴负半轴交于点A,与x轴正半轴交于点B,与y轴负半轴交于点C,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/753d1816-2921-41b5-804a-89e4f8c4050a.png?resizew=409)
(1)点C的坐标为______;抛物线的函数表达式为______;
(2)点D是
上一点(不与点A、O重合),过点D作x轴的垂线,交抛物线于点E,交
于点F,当
时,求点E的坐标;
(3)设抛物线的对称轴l交x轴于点G,在(2)的条件下,点M是抛物线对称轴上一点,点N是坐标平面内一点,是否存在点M、N,使以A、E、M、N为顶点的四边形是菱形.若存在,直接写出点N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/8b5f752d0257c9aae75e212755abc1b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc7d561b6e56aabf90e7c585c04f0e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/753d1816-2921-41b5-804a-89e4f8c4050a.png?resizew=409)
(1)点C的坐标为______;抛物线的函数表达式为______;
(2)点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1912bf376993b6c37c31b0ef317a83c.png)
(3)设抛物线的对称轴l交x轴于点G,在(2)的条件下,点M是抛物线对称轴上一点,点N是坐标平面内一点,是否存在点M、N,使以A、E、M、N为顶点的四边形是菱形.若存在,直接写出点N的坐标;若不存在,请说明理由.
更新时间:2022-12-27 13:49:32
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【推荐1】如图,在平面直角坐标系中,抛物线
与
轴交于点
,与
轴交于点
,顶点为
,抛物线的对称轴与
轴的交点为
.
(1)求抛物线的解析式及
点的坐标;
(2)设点
是抛物线对称轴上一点,且
,求点
的坐标;
(3)点
的坐标为
,若点
在该抛物线的对称轴上,以
为圆心的圆过
两点,并且和直线
相切,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e402b4a6c5280d60cbac93a1a6ea97e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求抛物线的解析式及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b1463ec3aab10266f397b69f4d9372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db588d1dde514ea62bd6f3e5abcd1fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2018/8/18/2012886408953856/2013277067993088/STEM/fe1ba1f5a1304849a0d24e8cbe7e8e91.png?resizew=376)
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【推荐2】如图,抛物线y=﹣
x2+bx+c与x轴交于点A,点B,与y轴交于点C,点B坐标为(6,0),点C坐标为(0,6),点D是抛物线的顶点,过点D作x轴的垂线,垂足为E,连接BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/21c0c22e-bb4f-4361-b264-72557559a49b.png?resizew=271)
(1)求抛物线的解析式及点D的坐标;
(2)点F是抛物线上的动点,当∠FBA=∠BDE时,求点F的坐标;
(3)若点M是抛物线上的动点,过点M作MN
x轴与抛物线交于点N,点P在x轴上,点Q在平面内,以线段MN为对角线作正方形MPNQ,请直接写出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/21c0c22e-bb4f-4361-b264-72557559a49b.png?resizew=271)
(1)求抛物线的解析式及点D的坐标;
(2)点F是抛物线上的动点,当∠FBA=∠BDE时,求点F的坐标;
(3)若点M是抛物线上的动点,过点M作MN
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
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【推荐1】如图,在矩形
中,
,
,点
在对角线
上(不与点
、
重合),以
为圆心,以
为半径作圆
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/4/24/2706666699587584/2709095987142656/STEM/9da15381-2957-4a0c-be8d-77679a89804f.png?resizew=229)
(1)
______;
(2)若圆
经过点
,求圆
的面积;
(3)若圆
与
的边所在直线相切,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/4/24/2706666699587584/2709095987142656/STEM/9da15381-2957-4a0c-be8d-77679a89804f.png?resizew=229)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc7aa1208ad706c46b37453e3087a90.png)
(2)若圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(3)若圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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【推荐2】如图,已知抛物线y=ax2+bx+3的对称轴是直线x=1,与x轴交于点A、B,与y轴交于点C,其中点A的坐标是(﹣1,0).
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424532045824/2926966976249856/STEM/ff80051377ad4003aee2790d2e3da0e0.png?resizew=309)
(1)直接写出点B的坐标并求出抛物线的解析式;
(2)点P是抛物线上的一个动点.
①当∠PCB=
∠OCB时,求点P的坐标;
②当点P在B、C两点之间运动时,连接AP,交BC于点Q,设t=
,求当t值最大时点P的坐标.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923424532045824/2926966976249856/STEM/ff80051377ad4003aee2790d2e3da0e0.png?resizew=309)
(1)直接写出点B的坐标并求出抛物线的解析式;
(2)点P是抛物线上的一个动点.
①当∠PCB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
②当点P在B、C两点之间运动时,连接AP,交BC于点Q,设t=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/309a2878b50bd2a02364f52bcfe5354e.png)
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【推荐1】如图1,在平面直角坐标系中,抛物线
经过点
和点
,交
轴于点
.
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681305267937280/2683981909016576/STEM/5a6e66c7-dec1-46b3-9287-60414338508d.png)
(1)求抛物线的解析式及顶点
的坐标;
(2)点
是抛物线上
、
之间的一点,过点
作
轴于点
,
轴,交抛物线于点
,过点
作
轴于点
,当矩形
的周长最大时,求点
的坐标;
(3)如图2,连接
、
,点
在线段
上(不与
、
重合),作直线
轴交抛物线于点
,是否存在点
,使得
与
相似?若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681305267937280/2683981909016576/STEM/5a6e66c7-dec1-46b3-9287-60414338508d.png)
(1)求抛物线的解析式及顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae95e96ce568efee50145f8d017353df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb6d329bf09c53be35dd32aa3805d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4c5119c63ea86e97ad2ac7c84a423b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3f1c63921a86b0493c0c6ba5793a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/52cbeb9b1c1d637b903cf3e5c7f730f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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名校
【推荐2】如图1,已知抛物线;C1:y=﹣
(x+2)(x﹣m)(m>0)与x轴交于点B、C(点B在点C的左侧),与y轴交于点E.
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399353953271808/2399625978699776/STEM/61e6712f128347a191761e3b9fba45f0.png?resizew=495)
(1)求点B、点C的坐标;
(2)当△BCE的面积为6时,若点G的坐标为(0,b),在抛物线C1的对称轴上是否存在点H,使得△BGH的周长最小,若存在,则求点H的坐标(用含b的式子表示);若不存在,则请说明理由;
(3)在第四象限内,抛物线C1上是否存在点F,使得以点B、C、F为顶点的三角形与△BCE相似?若存在,求m的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a60e77043cfa243c212f9e340c5f46.png)
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399353953271808/2399625978699776/STEM/61e6712f128347a191761e3b9fba45f0.png?resizew=495)
(1)求点B、点C的坐标;
(2)当△BCE的面积为6时,若点G的坐标为(0,b),在抛物线C1的对称轴上是否存在点H,使得△BGH的周长最小,若存在,则求点H的坐标(用含b的式子表示);若不存在,则请说明理由;
(3)在第四象限内,抛物线C1上是否存在点F,使得以点B、C、F为顶点的三角形与△BCE相似?若存在,求m的值;若不存在,请说明理由.
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【推荐3】如图,抛物线
与x轴交于A、B两点(A点在B点左侧),与y轴交于点C,对称轴为直线
,OA = 2,OD平分∠BOC交抛物线于点D(点D在第一象限).
![](https://img.xkw.com/dksih/QBM/2010/12/9/1574120964890624/1574121059418112/STEM/6bbb42cf148c4e5886dc7c8988acb7bc.png)
(1)求抛物线的解析式和点D的坐标;
(2)在抛物线的对称轴上,是否存在一点P,使得△BPD的周长最小?若存在,请求出点P的坐标;若不存在,请说明理由.
(3)点M是抛物线上的动点,在x轴上是否存在点N,使A、D、M、N四个点为顶点的四边形是平行四边形?如果存在,求出所有满足条件的M点坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e2dc6a5ceee4f06b564b702235ca72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
![](https://img.xkw.com/dksih/QBM/2010/12/9/1574120964890624/1574121059418112/STEM/6bbb42cf148c4e5886dc7c8988acb7bc.png)
(1)求抛物线的解析式和点D的坐标;
(2)在抛物线的对称轴上,是否存在一点P,使得△BPD的周长最小?若存在,请求出点P的坐标;若不存在,请说明理由.
(3)点M是抛物线上的动点,在x轴上是否存在点N,使A、D、M、N四个点为顶点的四边形是平行四边形?如果存在,求出所有满足条件的M点坐标;如果不存在,请说明理由.
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解题方法
【推荐1】已知关于
的二次函数
(
>0)的图象经过点C(0,1),且与
轴交于不同的两点A、B,点A的坐标是(1,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/982fee48-e3f6-4041-a87b-e89813a18575.png?resizew=168)
(1)求c的值和
,
之间的关系式;
(2)求
的取值范围;
(3)该二次函数的图象与直线
交于C、D两点,设 A、B、C、D四点构成的四边形的对角线相交于点P,记△PCD的面积为S1,△PAB的面积为S2,当0<
<l时,求证:S1-S2为常数,并求出该常数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/982fee48-e3f6-4041-a87b-e89813a18575.png?resizew=168)
(1)求c的值和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)该二次函数的图象与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】如图,已知抛物线与y轴交于点C(0,3),与x轴交于点A、B,点A在点B的左边,且B(3,0),AB=2
(1)求该抛物线的函数关系式;
(2)如果抛物线的对称轴上存在一点P,使得△APC的周长最小,求此时P点的坐标,并求出△APC周长;
(3)设D为抛物线上一点,E为对称轴上一点,若以点A、B、D、E为顶点的四边形是平行四边形,求点D的坐标.
(1)求该抛物线的函数关系式;
(2)如果抛物线的对称轴上存在一点P,使得△APC的周长最小,求此时P点的坐标,并求出△APC周长;
(3)设D为抛物线上一点,E为对称轴上一点,若以点A、B、D、E为顶点的四边形是平行四边形,求点D的坐标.
![](https://img.xkw.com/dksih/QBM/2016/12/16/1633712422961152/1633712423428096/STEM/f66c93b03a134bc681e0d92adabc4ea0.png)
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【推荐3】如图,已知抛物线
:
与y轴相交于点C,顶点为D.
(2)点P为直线CD左上方抛物线上的一动点,过点P作y轴的平行线交直线CD于点Q,当线段PQ取得最大值时,在抛物线的对称轴上找一点G,使
的周长最小,求点G的坐标;
(3)将抛物线
向左平移2个单位长度得到抛物线
,
与
相交于点E,点F为抛物线
对称轴上的一点,在平面直角坐标系中是否存在点H,使以点C,E,F,H为顶点的四边形为菱形,若存在,请直接写出点H的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34081d1ee5e18cb9c3f6b324553349f.png)
(2)点P为直线CD左上方抛物线上的一动点,过点P作y轴的平行线交直线CD于点Q,当线段PQ取得最大值时,在抛物线的对称轴上找一点G,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f12a227f113313bdd42728e666e4614.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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