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解题方法
1 . 在锐角
中,内角
所对的边分别为
,
,
.
(1)若
,证明:
;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dc118124f223e00f0c7b10edcd93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1114b844963e148059a373f839688ceb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe844a09d69e58d1ba52b7f05ae621b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c30ec3d250238471d07d315dad12520.png)
您最近一年使用:0次
2023-02-14更新
|
865次组卷
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2卷引用:湖南省湘潭钢铁集团有限公司第一子弟中学2023届高三下学期入学考试数学试题
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2 . 如图,在正方形ABCD中,M,N分别为BC,CD上的动点,其中∠MAB=
>0,∠MAN=
>0,∠NAD=
>0.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/70c1f941-74bb-4eb2-a52f-78f13eb73248.png?resizew=157)
(1)若M为BC的中点,DN=
DC,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)求证:
+
+
=1.
![](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/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/70c1f941-74bb-4eb2-a52f-78f13eb73248.png?resizew=157)
(1)若M为BC的中点,DN=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f04d44d8e08c76a9f5bc24413cf49b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e8c51789fb844ba29d54026f8a0202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86dc3915a30c7a7027c54154e35b4165.png)
您最近一年使用:0次
2023-02-18更新
|
419次组卷
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5卷引用:河南省信阳市浉河区信阳高级中学2022-2023学年高一下学期开学考试数学试题
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3 . 已知
.
(1)若向量
,求
的值;
(2)若向量
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4175e386fe43c7d978399ba879abf7.png)
(1)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26eeefc4edf0053e9a00ab7d4c350d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dec9da1a84c65b9698c1cd70851dfdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f208cd288e41ca2ba27c6c47d7647da.png)
您最近一年使用:0次
2020-05-27更新
|
3435次组卷
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7卷引用:广东省肇庆市第一中学2023-2024学年高二上学期开学考试数学试题
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