如图,在梯形
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/dabd6acd-5a77-4962-80ee-7914efccdcde.png?resizew=284)
(1)求
的长;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1b407a086ea9bdfa6fa598b1d5557b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e7f748d88b4eadfd1643c6b31fdf08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7f8024c3cd38ffff8fe5002d128060.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/dabd6acd-5a77-4962-80ee-7914efccdcde.png?resizew=284)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e645129e4853159372d4aa26a8e611b3.png)
更新时间:2020-03-16 15:51:59
|
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解答题-计算题
|
适中
(0.65)
【推荐1】已知
.
(1)化简
;
(2)若
,求
的值;
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5d67916a5c849b5f46afe3ac1be108.png)
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794f2c6bd63355105d179d11306a9cae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e2faf28dd550fedb35601391a5286a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ba6b6ee00c4b2763cb3fa59caa69f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb93a6d5990e57351c1d5139a8630e5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ba6b6ee00c4b2763cb3fa59caa69f.png)
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解答题-问答题
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(0.65)
名校
【推荐2】已知函数
.
(1)若函数
是奇函数,求
的最小值;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e7ff11cec5de2ea44f1fbca11ee887.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0522ef90d8c6cb8b7953fda724f5744c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a771f2e80c8a29ed2ebd76498b0f49.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4243d72b40be97b1dce3823e49a60011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5653b4620620d07b555e4a6c9ff91f6.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】如图,某市郊外景区内一条笔直的公路经过三个景点
,
,
.为增加景区人民的收入,景区管委会又开发了风景优美的景点
.经测量景点
位于景点
的北偏东
方向
处,位于景点
的正北方向上,还位于景点
的北偏西
方向上,已知
,
.
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599219254525952/2599844948893696/STEM/3a1b369c3db84007ab4eeefa80bf6373.png?resizew=236)
(1)景区管委会准备由景点
向景点
修建一条笔直的公路,不考虑其他因素,求出这条公路的长;
(2)求
的正弦值.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90eee1ed6e52706ac4dbcf2afa4c3555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383cabdd8b3c8b532254a351401942db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71204e3376704fdaca1f0219a317e88.png)
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599219254525952/2599844948893696/STEM/3a1b369c3db84007ab4eeefa80bf6373.png?resizew=236)
(1)景区管委会准备由景点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
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【推荐2】已知
,
.
(1)求
;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef966cdd137b3b10e290201b4d17542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de418d64e1c7dbe4edb1053a102f798.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad6c52216a9bf7f367bb9cfd6edc156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e744af0f65e797a35d976c20f2dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
您最近一年使用:0次
解答题-问答题
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解题方法
【推荐1】在△ABC中,内角A,B,C的对边分别为a,b,c,满足
,且
.
(1)证明:
;
(2)若
,
,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a107cc222fe29f7a64d1149e621d496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/069390dd908ff203327958117a226593.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab919b06a2f3252a903786de0b8e4fda.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b61877786647905648a5da06c0562b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80492356de83a14612ca57cf6c1de5c4.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】设
的内角
,
,
所对的边长分别为
,
,
,且
,
,
.
(1)求
的面积;
(2)求
的值及
中内角
,
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1466856bf2570685d3629c1f813748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a45d1f198450c657c533f1180a3be9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a3697cec523009ccbaa87d793dc7e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
您最近一年使用:0次