如图,在平面直角坐标系
中,以
为角的顶点,
轴正半轴为始边的角
,
的终边分别与单位圆交于点
,
,若点
的横坐标是
,点
的纵坐标是
.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625387432689664/1626147209289728/STEM/5b98eb6016294d328fe908a193ba263d.png?resizew=154)
(1)求
的值;
(2)求
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba564f8149fb98ee50c4012f06708382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9c6fe12d3a9727e00ef87a630302ab.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625387432689664/1626147209289728/STEM/5b98eb6016294d328fe908a193ba263d.png?resizew=154)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f65e4a08ff43908b2e8b6726ffd7ca8.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eeb629a6f94d187154b9e0fba4eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987a2625dae99578e5c0e7b57d4a1c2f.png)
16-17高一上·安徽池州·期末 查看更多[2]
更新时间:2017-02-17 21:47:52
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,圆C:
与圆O:
内切于点A,当圆C沿圆O逆时针方向无滑动地滚动一周时,圆C上的定点P(开始在点A)运动的轨迹是一个三叶轮.已知圆C上的定点P按这种运动方式从点A开始运动(B是两圆的切点).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/fddcfe0b-943a-40b1-a8ab-159fe401e6ab.png?resizew=170)
(1)若
,求点P的坐标;
(2)若
,求点P的轨迹关于
的参数方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9df0d79e42d86b0def4caa10dffa75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08227ca941898eb34941f446ca8b1de8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/fddcfe0b-943a-40b1-a8ab-159fe401e6ab.png?resizew=170)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e00f8bacce4d649b535449f04568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】(1)已知点
在角
的终边上,且
,求
和
的值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8eeec247a225410b66f4be1d3a264f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349252bd781a0b4c464812caf3f8ea26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb49947eb370e18720a191b18796c6f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e91e91d2f96849ff6dcec784849d666.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐3】在推导很多三角恒等变换公式时,我们可以利用平面向量的有关知识来研究,在一定程度上可以简化推理过程.如我们就可以利用平面向量来推导两角差的余弦公式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
具体过程如下:
如图,在平面直角坐标系
内作单位圆O,以
为始边作角
.它们的终边与单位圆O的交点分别为A,B.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/3378e1b0-11ac-4e21-89d7-e7bef545c1e9.png?resizew=334)
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98717138350884b83b2bc3335ac3262.png)
由向量数量积的坐标表示,有:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437ebce60a1d755209353f0d94462154.png)
设
的夹角为θ,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665d77a90728ca9eb4d63b07dbe89e80.png)
另一方面,由图3.1—3(1)可知,
;由图可知,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8e003e58-f755-4f57-ba40-42e3c44c2f0e.png?resizew=348)
.于是
.
所以
,也有
,
所以,对于任意角
有:
(
)
此公式给出了任意角
的正弦、余弦值与其差角
的余弦值之间的关系,称为差角的余弦公式,简记作
.
有了公式
以后,我们只要知道
的值,就可以求得
的值了.
阅读以上材料,利用下图单位圆及相关数据(图中M是AB的中点),采取类似方法(用其他方法解答正确同等给分)解决下列问题:
(1)判断
是否正确?(不需要证明)
(2)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889623d5e61054f38a35aedd644c9ff5.png)
(3)利用以上结论求函数
的单调区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
具体过程如下:
如图,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa404d3ff313b0a28a76a48d7d87234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/3378e1b0-11ac-4e21-89d7-e7bef545c1e9.png?resizew=334)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98717138350884b83b2bc3335ac3262.png)
由向量数量积的坐标表示,有:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437ebce60a1d755209353f0d94462154.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538844ce819df320039e394ba92356f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665d77a90728ca9eb4d63b07dbe89e80.png)
另一方面,由图3.1—3(1)可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655ee7e11f540619722504916419e009.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8e003e58-f755-4f57-ba40-42e3c44c2f0e.png?resizew=348)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18eedcc65589e7529da85a578bd0ecb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e366809cf946d825277ad151abb374a2.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a689c643b92f5fafe77fb2c754b0184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
所以,对于任意角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74ca761ffa2566a9851c5ce9ccaaf.png)
此公式给出了任意角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd927b4b5a7875528c1b54aa4bb8b2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74ca761ffa2566a9851c5ce9ccaaf.png)
有了公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74ca761ffa2566a9851c5ce9ccaaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1455db71a4123b3317dcfce3e2005e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d521f8d021b20757d7a68107fcef1d.png)
阅读以上材料,利用下图单位圆及相关数据(图中M是AB的中点),采取类似方法(用其他方法解答正确同等给分)解决下列问题:
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f93aa4ff886e380c9b7c05dbafd08d.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889623d5e61054f38a35aedd644c9ff5.png)
(3)利用以上结论求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1414c4eb3a476aac49f6a35d62b1f7ac.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知O为坐标原点,对于函数
,称向量
为函数
的相伴特征向量,同时称函数
为向量
的相伴函数.
(1)记向量
的相伴函数为
,若当
且
时,求
的值;
(2)设
,试求函数
的相伴特征向量
,并求出与
共线的单位向量;
(3)已知
,
,
为函数
的相伴特征向量,
,请问在
的图象上是否存在一点
,使得
?若存在,求出
点的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c35bc94da4e71c14a5b96403ee84a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4f4198d8ac9aba8ae467e891c09e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e723e57753f0a4fe1ef8ca1aee0e2117.png)
(1)记向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ccfa3ff508a3df0431ccb7a883c343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a4c1ab59bff3b3717a1be891b859d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d501db93d37ec9a5b86320cf8a6ce67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752b203a44ac20aa238802f62f42fd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028517e8bebe634441e0a5c79828e88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e723e57753f0a4fe1ef8ca1aee0e2117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e723e57753f0a4fe1ef8ca1aee0e2117.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d82ce1b2ab811e07c2a9aee798958ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef72b5d65c5bc4a941e19dd9ad124a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38aae92975b27d8f1451dc8c52576153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a07e64d78878bd64d8f5a50245b088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfe71674715b21c0f0aa665b4de180b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c087cba6516cfb66c9d346df7e8a24b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b929fe0f9c13dd6dfabca91a1a4aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐2】铰链又称合页,是用来连接两个固体并允许两者之间做相对转动的机械装置.铰链由可移动的组件构成,或者由可折叠的材料构成,合页主要安装与门窗上,而铰链更多安装与橱柜上,如图所示,
就是一个合页的抽象图,
可以在
上变化,其中
,正常把合页安装在家具门上时,
的变化范围是
,根据合页的安装和使用经验可知,要使得安装的家具门开关并不受影响,在以
为边长的正三角形
区域内不能有障碍物.
(1)若
使,求
的长;
(2)当
为多少时,
面积取得最大值?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55cfcbb5c5950e18a8452b38bb17036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8107678c7709e1ef6aea705dbd0e85c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f8879c9994fe5c7681d7a754be0279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/61caf8e3-bd02-4656-930f-42e960e2a42f.png?resizew=128)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42789f54f6d3e1d508837711c6a873b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知点
为坐标原点,椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a4756fb98d4159aa82a7a179dad02b.png)
的左、右焦点分别为
,
,通径长(即过焦点且垂直于长轴的直线与椭圆
相交所得的弦长)为3,短半轴长为
.
(1)求椭圆
的标准方程;
(2)设过点
的直线
与椭圆
相交于
,
两点,线段
上存在一点
到
,
两边的距离相等,若
,间直线
的斜率是否存在?若存在,求直线
的斜率的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a4756fb98d4159aa82a7a179dad02b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f82eb4ba631d0f50d848aa6e576b379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aac1391edae471b8d48d2d70d17f466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195a7dca9e2f7e7f29b46b22b17d7772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aac1391edae471b8d48d2d70d17f466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d3682ecfaffa508dbbfce7b5079ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5f900d25603794d81503c48d07ee6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f3052818b4107b46aed9796ff18cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】我们把一系列向量
按次序排成一列,称之为向量列,记作
,已知向量列
满足:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e7f48a7a96c821e0059df5933335b5.png)
.
(1)证明:数列
是等比数列;
(2)设
表示向量
与
间的夹角,若
,
,求
;
(3)设
,问数列
中是否存在最小项?若存在,求出最小项;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ebe8b02d5c9fb1a3241a7e899d53ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a85cead056c360dc3a253f4b33e80e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a85cead056c360dc3a253f4b33e80e0.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572135465951232/1572135471996928/STEM/6df823baa4bb4c6aa8053d3866018f22.png?resizew=57)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e7f48a7a96c821e0059df5933335b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/795b380a4edc07fb7517ea7936e59265.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ffa8be5a02790c6161c56b8e90db64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2121e9cac7d80abd7c6a0c0de5c67a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522e062601bd8cbf0e1dfb46dc99479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4506abed8b5a14dee3a38ba1fd91b4c3.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572135465951232/1572135471996928/STEM/15bd93f8f8f04af297b9e54ad6e04037.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd16ce07d0179ddfc7a5c7202ae4a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】已知
为
所在平面内一点,满足
,且
的面积为
.
(1)求
的值;
(2)求
的值;
(3)若点
是线段
上一点,过点
分别向
作垂线,垂足分别为E,F,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f434955904bfc18d7062db95d4c44ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b12efb03327f461e868b2ea433f9b0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad71547a1a45cc7b11d6ecde59884c7.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd18b7f9164b68dd88a5f976c099b3c.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58e08ee0b2580a62cf20f709b5e90df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b89b3f2de8a3e84b1c6d4dda922d1f0.png)
您最近一年使用:0次