如图,在平面直角坐标系中,矩形
的顶点C,A分别在x轴,y轴上,O为坐标原点,B点的坐标为
,过A点的直线l与x轴交于点
,P是线段
上一动点,设
.
(1)
是第一象限直线l上一点,作
轴于E,
轴于F,若
,
.
①求证:
;
②求直线l的表达式及D点的坐标;
(2)将直线l向下平移12个单位得到直线
,在直线
上方的直线
上,是否存在这样的点D,使得
,且
,若存在,请求出点D的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba31c1dd27defc2621e4fb4d7006f7f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062c5034549feeda6526870858e6cc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554645462113f7c8e22f7ac28887f5c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/054051a3-7c5c-4268-bc22-29f0e2fbe644.png?resizew=443)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ad84a84ed0f550020f561dae537a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20f744fdc339b1d7395cb32a4b5e07f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c6c11ccee199cb04792115cee11fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137eebd1621a51cc5af32b373d983d2e.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e3684f55b9dc99032e756a5cd8fc04.png)
②求直线l的表达式及D点的坐标;
(2)将直线l向下平移12个单位得到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c5ace226a547e68702df548b08cb5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d057c8a707abd8d2e07e3b0fbbf8b81.png)
21-22八年级下·湖南益阳·期末 查看更多[2]
更新时间:2023-08-21 13:36:04
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【推荐1】甲、乙两车分别从相距490千米的A、B两地相向而行,乙车比甲车先出发1小时,并以各自的速度匀速行驶,甲车到达C地后因有事按原路原速返回A地.乙车从B地直达A地,两车同时到达A地.甲、乙两车距各自出发地的路程y(千米)与甲车出发所用的时间x(小时)的关系如图所示,结合图象信息解答下列问题:
(1)乙车的速度是______千米/时.
(2)直接写出图中
______,
______.
(3)求甲车从C地按原路原速返回A地的过程中,甲车距它出发地的路程y与它出发的时间x的函数关系式.
(4)直接写出甲车出发多长时间两车相距60千米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/e15d2092-f5d6-4b4e-965a-53c5eecb33b3.png?resizew=204)
(1)乙车的速度是______千米/时.
(2)直接写出图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(3)求甲车从C地按原路原速返回A地的过程中,甲车距它出发地的路程y与它出发的时间x的函数关系式.
(4)直接写出甲车出发多长时间两车相距60千米.
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【推荐2】在平面直角坐标系中,点O为坐标原点,点A的横坐标为a,点A的纵坐标为b,且实数a,b满足
.
(2)如图2,过点A作x轴的垂线,垂足为点B.已知点
,连接CA,CB,请在y轴上找一点P,使
的面积与
的面积相等,并求出点P的坐标.
(3)在(2)的条件下,在x轴上是否存在一点Q,使
为等腰三角形,若存在,请求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c83425c41c9e1c6d07c0f7cf4ae3912.png)
(2)如图2,过点A作x轴的垂线,垂足为点B.已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e76fa9da11a6c6abc1d767bc563343d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在(2)的条件下,在x轴上是否存在一点Q,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
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【推荐1】如图,在平面直角坐标系中,直线
与
轴交于点
,点
,在直线
上,点
是线段
上的一个动点,过点
作
轴交直线
点
,设点
的横坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/f367f989-9be6-4ce8-a0e7-c03a2adba113.png?resizew=169)
(1)
的值为__________;
(2)用含有
的式子表示线段
的长;
(3)若
的面积为
,求
与
之间的函数表达式,并求出当
最大时点
的坐标;
(4)在(
)的条件下,把直线
沿着
轴向下平移,交
轴于点
,交线段
于点
,若点
的坐标为
,在平移的过程中,当
时,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7efb3515e03b5311dd2bab3da0ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99ec9f6a0bec41cb7f0da2d272c26d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3abfdd1e8e9a16c04d58ee0cc3382192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/f367f989-9be6-4ce8-a0e7-c03a2adba113.png?resizew=169)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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(4)在(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e42980901f51bc2cde929605245ae9.png)
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解答题-作图题
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【推荐2】请直接在平面直角坐标系中画出函数y=2x-2的图象,并根据图象回答下列问题:
(1)函数图象不经过第象限.
![](https://img.xkw.com/dksih/QBM/2019/8/1/2259418439876608/2266379156234241/STEM/952b87c7f0fb447d81623b69368f6437.png?resizew=147)
(2)将y=2x-2的图象向下平移后经过点M(1,-3),求平移后的函数解析式.
(1)函数图象不经过第象限.
![](https://img.xkw.com/dksih/QBM/2019/8/1/2259418439876608/2266379156234241/STEM/952b87c7f0fb447d81623b69368f6437.png?resizew=147)
(2)将y=2x-2的图象向下平移后经过点M(1,-3),求平移后的函数解析式.
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【推荐1】某数学学习小组学习完四边形后进行了如下探究,已知四边形
为矩形,请你帮助他们解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
的顶点
、
分别在如图(1)所示的
的边
、
上,顶点
、
恰好落在
的对角线
上,求证:
;
(2)【深入探究】:如图2,若
为菱形,
,若
,求
的值;
(3)【拓展延伸】:如图(3),若
为矩形,
;
且
,请直接写出此时
的值是________(用含有
,
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f90a3773e6944013a0eb41279f332f.png)
(2)【深入探究】:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e9fe9bcc967fb43ea66ab995f7c1c9.png)
(3)【拓展延伸】:如图(3),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3be96420ac78c8621fcb47a45514fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7be5da220f32cb7c8aad9ca5ced32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01943be6d886ec97fc1c18e73b0d4ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】在平面直角坐标系中,点
,
,点C为x轴正半轴上一动点,过点A作
交y轴于点E.
(1)如图①,求证:
;
(2)如图②,若点C在x轴正半轴上运动,且
,连接DO.
①求证:
;
②当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee80939187a84e1863eeb192a301c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc88ea5357b675c01e93c62fea338d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/509e7f3f-b672-4eae-8f6a-d83e9e178864.png?resizew=470)
(1)如图①,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f58341372bf06bc72d1f5168b72261a.png)
(2)如图②,若点C在x轴正半轴上运动,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d790b2c92982b0b2ccc44822d9e42c65.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae55504a8ede7dbb8a3d95b2edd44e33.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0b0b50e36ff959071c39eb317e609f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931992a75efd3f98f569f517235688cd.png)
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名校
【推荐1】综合与实践
【问题情境】在数学活动课上,同学们以等边三角形为背景,探究动点运动过程中产生的数学问题.已知
是等边三角形,
,点
是射线
上的一点,以
为边作矩形
(顶点
,
,
,
按逆时针顺序排列),其中
,直线
分别与射线
、直线
交于点
,
.
1.【初步探究】针对老师给出的问题背景,小敏画出了点
与点
重合时的图形,如图
,并提出如下问题,请你解答:
(1)猜想
与
的数量关系,并说明理由;
2.【深入思考】
(2)在小敏研究的基础上,小捷同学画出了点
恰好是
的中点时的图形,如图
,求此时
的值;
3.【拓展延伸】
(3)在点
运动过程中,直接写出当
时
的值.
【问题情境】在数学活动课上,同学们以等边三角形为背景,探究动点运动过程中产生的数学问题.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58052cd7d89b0d8556f5a082162dc324.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
1.【初步探究】针对老师给出的问题背景,小敏画出了点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
2.【深入思考】
(2)在小敏研究的基础上,小捷同学画出了点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38045bc304b504929add4ff5b93509e3.png)
3.【拓展延伸】
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1defd7bd31b50762679d1439aa9b67cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38045bc304b504929add4ff5b93509e3.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图 1,将
纸片沿中位线
折叠,使点 A 对称点 D 落在
边上, 再将纸片分别沿等腰
和等腰
的底边上的高线
,
折叠,折叠后的三个三角形拼合形成一个矩形,类似地,对多边形进行折叠,若翻折后的图形恰能拼合成一个无缝隙、无重叠的矩形,这样的矩形称为叠合矩形.
(1)将
纸片按图 2 的方式折叠成一个叠合矩形
,则
.
(2)
纸片还可以按图 3 的方式折叠成一个叠合矩形
,若
,
, 则
的长为 ;
(3)如图 4,四边形
纸片满足
,
,
,
,
, 小明把该纸片折叠,如图 5 得到叠合正方形,请你帮他求出
、
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2051742fa22ebe2c63538e2fb447dcce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/99e25474-597a-4eb7-824f-5c8312ca7e42.png?resizew=573)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f191d35939f52c92d6350e0382d486.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7c422a19b68b8b4cd484d22897e3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4385b5fedee454b8ea4448ff884c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)如图 4,四边形
![](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/f4652f95f3a388706906bc85f53f8db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640f058b479299659893cf524ddf6544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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