2024·全国·模拟预测
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1 . 美国数学史家、穆伦堡学院名誉数学教授威廉・邓纳姆在1994年出版的The Mathematical Universe一书中写道:“相比之下,数学家达到的终极优雅是所谓的‘无言的证明’,在这样的证明中一个极好的令人信服的图示就传达了证明,甚至不需要任何解释.很难比它更优雅了.”如图所示正是数学家所达到的“终极优雅”,该图(
为矩形)完美地展示并证明了正弦和余弦的二倍角公式,则可推导出的正确选项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-04-28更新
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252次组卷
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3卷引用:2024届新高考数学原创卷3
2023高三上·全国·专题练习
2 . 记锐角
的内角A,B,C的对边分别为a,b,c,分别以a,b,c为边长的三个正三角形的面积依次为
,已知
,
. 证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf4e20ea341827ce5f9552daee39462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a95f9136fe8f648f21b332447a49d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b48169818f3d1c3d618e0e2d157353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4bc0133b0db38f98ddb3f0380dddbf.png)
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解题方法
3 . (1)已知
,求
的值.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc61561503115c02511a17bbc484c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aae1dc870a60a2070469d556deb472.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09d27eb4a7aff691f64a075b915e997.png)
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4 . 如图,平面四边形
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/ea210778-1e94-4e71-bdb7-2798e7999dd2.png?resizew=142)
(1)求
的长;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddda8bee262f17d51ee3d70cf63d6b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a142e62d6cced71521f24824f4f2e30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/ea210778-1e94-4e71-bdb7-2798e7999dd2.png?resizew=142)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
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5 . 已知
,
,且
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae856a5db517275b60b7b75bbb575d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe338d9bb3657fa605427455785f8e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1c17a53981687048cb4906307f8b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f6eca9a9cda6e3f85f5f4d2f121e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e53d0b06e3fb0338bf97042e677a23.png)
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6 .
的内角
,
,
分别为
,
,
.已知
.
(1)求
;
(2)从下列①②③中选择两个作为条件,证明另外一个条件成立:
①
;②
;③
.
注:若选择不同的组合分别解答,则按第一个解答计分.
![](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/2e846a30ca142bdba9fd12d147be6860.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
(2)从下列①②③中选择两个作为条件,证明另外一个条件成立:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05554fc3fab6e31eb62fd6ee60625918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d803e27871810c6b8a7d6169144dd61.png)
注:若选择不同的组合分别解答,则按第一个解答计分.
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7 . 如图,在平面直角坐标系中.锐角
的终边分别与单位圆交于A、B两点,角
的终边与单位圆交丁C点,过点A、B、C分别作x轴的垂线,垂足分别为M、N、P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/c0f85623-f2bf-4bf6-beae-5e507130e39e.png?resizew=303)
(1)如果
,
,求
的值;
(2)求证:线段
能构成一个三角形;
(3)探究第(2)小题中的三角形的外接圆面积是否为定值?若是,求出该定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/c0f85623-f2bf-4bf6-beae-5e507130e39e.png?resizew=303)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6efeb7234307a1ed17ec46b9a33242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018bb7f777002fd6efa1018fe0431b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d521f8d021b20757d7a68107fcef1d.png)
(2)求证:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b93a2325daab9d0818c381107c7538b.png)
(3)探究第(2)小题中的三角形的外接圆面积是否为定值?若是,求出该定值;若不是,请说明理由.
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2021-07-15更新
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207次组卷
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2卷引用:上海市七宝中学2020-2021学年高一下学期期中数学试题