如图,
是
切线,
是直径,
交
于
,连接
并延长交
于
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/4dc2c9c5-3290-4806-82d2-630ae482bd29.png?resizew=466)
(1)证明:
;
(2)连接
交
于
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12c314dc346e29f4ab1e8c620ee4be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6478dc611d4d0842693c0a25c5f82555.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/4dc2c9c5-3290-4806-82d2-630ae482bd29.png?resizew=466)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3eac413b41c4e256f968d1dcdf2ea8.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
更新时间:2021-01-17 11:17:56
|
相似题推荐
解答题-证明题
|
困难
(0.15)
【推荐1】如图1,四边形
,
,
,点E从点B沿着线段
,
向终点D作匀速运动,运动速度为每秒2个单位.同时,点F从点B沿着线段
向终点C作匀速运动,它们同时到达终点.连结
,
,
,在运动过程中,设运动时间为t(秒),
的面积为S,S关于t的函数图象如图2所示.
(1)求证:
.
(2)当S最大时,求
的长.
(3)比较
与
的大小,并说明理由.
![](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/27a6aeab41d797662649e049a10f94a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/bf4ed502-f279-43c9-a3d0-5ca7f4e47d41.png?resizew=300)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349501dc24d32fd963027d88e1043540.png)
(2)当S最大时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】(1)【问题发现】
如图1,在
中,
,
.将
绕点B顺时针方向旋转
,点A的对应点为点E,连接
,则
.
如图2,在
中,
,D为
外一点,将
绕点A按逆时针方向旋转,使点B与点C重合得
,若
,
,探究线段
与
之间的数量关系,并证明你的结论;
如图3,在四边形
中,
,垂足为C,
,
,
,
,请用含k的式子表示
的长.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2036191be2322003aaee6bb411868327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b686b84b7a2b8e2326dbb88af5e855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45ef952d924f183bb2e0cdf794a62a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31025539da369c563e8633f375146593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a063938857a5cfdfab57144845c9d242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fdddadc89dc7ffbc92ceb4b49121f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22a9e80e0e2829d10fe3d6cbf972f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解题方法
【推荐1】如图,四边形
是
的内接矩形,过点
的切线与
的延长线交于点
,连接
与
交于点
,
,
.
(1)求证:
;
(2)设
,求
的值(用含
的式子表示);
(3)若
,求
的长度.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d3b244c7e855ade6e208035461d84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/7f5bb572-0821-46e3-8a12-d2f27618aa89.png?resizew=125)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f7c7ea1494e169102ee8dde72529cf.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415296f84bdf6f087f470a11ed596a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6867bfe8b8e62e0cacd75a59e604b124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-问答题
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(0.15)
名校
【推荐2】在平面直角坐标系
中,
的半径为2.对于直线
和线段BC,给出如下定义:若将线段
沿直线l翻折可以得到
的弦
(
,
分别是B,C的对应点),则称线段
是以直线l为轴的
的“关联线段”.例如:在图1中,线段BC的是以直线l为轴的
的“关联线段”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/96458f8c-2dbe-4783-97c4-f8e2460bcb02.jpg?resizew=425)
(1)如图2,点
,
,
,
,
,
的横、纵坐标都是整数.在线段
,
,
中,以直线l为轴的
的“关联线段”是______;
(2)
是边长为a的等边三角形,点
,若
是以直线l为轴的
的“关联线段”,求a的值;
(3)如果经过点
的直线上存在以直线l为轴的
的“关联线段”,直接写出这条直线与y轴交点的纵坐标m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06553b7e77205d053c1981e9c050d579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/96458f8c-2dbe-4783-97c4-f8e2460bcb02.jpg?resizew=425)
(1)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2857fac4963b129d99e79dcb3e13d295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97286f42173154565d6a99b55e1cb84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c119e960234477c13624ba5ee735841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)如果经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4542e81a6501064ab38db84bf869b28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,在Rt△ABC中,∠ACB=90°,AB=5cm,tan∠ABC=
,AD∥BC,且AD=2BC.动点P从点B出发以1cm/s的速度沿线段BD向终点D匀速运动,1秒后动点Q从点D出发以2cm/s的速度沿线段DA向终点A匀速运动,设点P运动的时间为t(s).
(2)点Q出发后,设四边形ACPQ的面积为S(cm2),求S与t的函数表达式;
(3)当PQ⊥AB时,求t的值;
(4)若以QD、QP为边作□DQPE,在整个运动过程中,是否存在某一时刻t,使点E在∠DAB的平分线上?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(2)点Q出发后,设四边形ACPQ的面积为S(cm2),求S与t的函数表达式;
(3)当PQ⊥AB时,求t的值;
(4)若以QD、QP为边作□DQPE,在整个运动过程中,是否存在某一时刻t,使点E在∠DAB的平分线上?若存在,求出t的值;若不存在,请说明理由.
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解答题-作图题
|
困难
(0.15)
【推荐2】问题探究
(1)如图1,请在半径为
的半圆
内(含弧和直径
)画出面积最大的三角形,并求出这个三角形的面积;
(2)如图2,请在半径为
的
内(含弧)画出面积最大的矩形
,并求出这个矩形的面积;
问题解决
(3)如图3,
是一块草坪,其中
,
,
,某开发商现准备再征一块地,把
扩充为四边形
,使
,是否存在面积最大的四边形
?若存在,求出四边形
的最大面积;若不存在,请说明理由.(结果保留根号)
(1)如图1,请在半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)如图2,请在半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
问题解决
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c83b688911f105cffe00d6d54eea13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691048ce61c91a8a3680fa3025193160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2443620196753408/2444851738132480/STEM/2fa5a94f001f442a971ee1be90d56b1e.png?resizew=387)
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名校
解题方法
【推荐3】回答下列各题:
(1)问题探究
①如图,在四边形
中,
,
,
.则
的面积为 .
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550953275875328/2551554616721408/STEM/894f49eb16154e54a797ae8575ea1274.png?resizew=162)
②如图,半圆
的直径
,
、
为半圆上两点,
,
,
为直径
上一动点,请求出
的最小值.
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550953275875328/2551554616721408/STEM/a35d6c5b05524719b0dd639329f27333.png?resizew=168)
(2)问题解决
如图,四边形
为公园中的一片花圃,现计划在四边形内找一点
,连接
、
,使得
、
将四边形
分成面积相等的两部分,分别用于种植两种不同品种的花,同时沿着
、
修一条观赏的道路.为了降低成本,公园管理人员希望
最小.以
为坐标原点,
所在直线为
轴,建立如图所示的平面直角坐标系,根据测量的数据可得,
,
,
,请探究是否存在满足要求的点
,若存在,请在图中作出点
,并求出点
的坐标;若不存在,请说明理由.
(1)问题探究
①如图,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550953275875328/2551554616721408/STEM/894f49eb16154e54a797ae8575ea1274.png?resizew=162)
②如图,半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.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/d8cc88685997c7586d1d4bf75a055433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3e928a6332cd4d892202cde63bf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186dee1a1cf68677d143172a2a50709c.png)
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550953275875328/2551554616721408/STEM/a35d6c5b05524719b0dd639329f27333.png?resizew=168)
(2)问题解决
如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e538ecb0f77fb4ac984f70241f5c3bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a42952b85622c1c5e461905c3278eee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fc5a8883324330ec5e459bb0ec489e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d067dcb06af03b0d9cb21d7ebd68915.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550953275875328/2551554616721408/STEM/10c47fb0f43847c1abf0486c827bf377.png?resizew=152)
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