如图所示,在
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615450953342976/2618437925969920/STEM/feafc7fe-cfd9-471b-9476-f2557ff619d1.png)
(Ⅰ)求
的长;
(Ⅱ)若
为
的中点,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e43f9e15b6dfc3d49a40f8fb543d468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615450953342976/2618437925969920/STEM/feafc7fe-cfd9-471b-9476-f2557ff619d1.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7940b61f4332a30e1d966328b26b6372.png)
更新时间:2020-12-20 20:48:30
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解答题-问答题
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适中
(0.65)
名校
【推荐1】
中,角
所对分别分别是
,且
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(1)求
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdfeeb5aa4861c9440373e0cec3df1bf.png)
(2)若
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解答题-问答题
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适中
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【推荐2】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b92b70365c63607daecdc8deb73ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db20d67f7d099c8d974e2f81954e023b.png)
(2)求函数
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您最近一年使用:0次
【推荐1】已知
的内角A,
,
的对边长分别等于
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,
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,③
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(1)请在①②③中选择其中一个条件作为依据,求角A的大小.(只需做出一种选择进行求解;多种选择的,按第一种选择评分.)
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面积的最大值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a55a288892083f8b5a468ea688acc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af4b6434998d2a4afbe18b4571fcac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/266522ac99182eac030aa0ebc79fcd95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)请在①②③中选择其中一个条件作为依据,求角A的大小.(只需做出一种选择进行求解;多种选择的,按第一种选择评分.)
(2)在(1)的结论的基础上再在④⑤中选择其中一个作为添加条件,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在四边形
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交于点P,
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/559fe3df-a79c-4e1f-97ad-e5d22a8d9960.png?resizew=216)
(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da51bc68df0c03f7cf81e03136fd690a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/559fe3df-a79c-4e1f-97ad-e5d22a8d9960.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c01c42bbb7a051ee5e5e60c79b8ae0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0858af3c08375b4fbef381dbbf60277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次