解题方法
1 . 在中,点
,
分别是
,
边上的中点,线段
,
交于点D,则
的值为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . △ABC的内角A,B,C的对边分别为a,b,c.已知
,
.
(1)求B;
(2)D为AC的中点,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c1e203cd07dd6bbea0df86bbd34e91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
(1)求B;
(2)D为AC的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8622c75f8ca19273334fe3a405887f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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3 . 在
中,
,
,M点为BC的中点,N点在线段AC上且
,
.
(1)求AC;
(2)若点P为AM与BN的交点,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba03505a2ec6653c4a65830d61694c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a07a68f3e85fe37916fb89f2f09ffa36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1b3c262e8bf58c8479708d7496bbcd.png)
(1)求AC;
(2)若点P为AM与BN的交点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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2023-06-21更新
|
587次组卷
|
2卷引用:广东省佛山市禅城区2023届高三模拟预测(二)数学试题
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4 . 在△ABC中,AB=4,AC=3,
.若点D为边BC的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e589c313a4cbd49e1a916c2fe11a99.png)
_____________ ;若点D在边BC上(不包含端点),延长AD到P,使得
,且满足
(m为常数),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32fc82f9e1a501fcf4fc9973d2a2de31.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32fad79f8d1d779c06e4dc2a6dd4daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e589c313a4cbd49e1a916c2fe11a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d412d12c1a63e71d8389162d1ad06b08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f992e82ed3ba48c20c645719053bdb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32fc82f9e1a501fcf4fc9973d2a2de31.png)
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5 . 已知
,
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bd4339dd59c9dfe74baadbb59ef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a42060c053618ee1ebf6af3bacbce7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 在
中,
分别为
的中点,
为
与
的交点,且若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
__________ ;若
在
上的投影向量的模长为1,则
在
上的投影向量的模长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a653b4b2825534b21e829481e7bc3a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d524789a140ff9ad3dc48bce1fdbed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29eb3e0597c01f857ef60a755b263c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
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2023-05-28更新
|
843次组卷
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2卷引用:天津市新华中学2023届高三下学期统练7数学试题
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解题方法
7 . 2000多年前,古希腊雅典学派的第三大算学家欧道克萨斯首先提出黄金分割.所谓黄金分割点,指的是把一条线段分割为两部分,使其中一部分与全长之比等于另一部分与这部分之比,黄金分割比为
.如图,在矩形
中,
与
相交于点
,
,且点
为线段
的黄金分割点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139de7b8bdfb522a3f34626400e986dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056593fd680a418817d83d48ef0be879.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/a4e5d59e-d2ac-4e90-aecb-cee883b228ba.png?resizew=187)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
8 . 已知正方体
的棱长为2,动点P满足
,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e6359d06a80e16282aea2401b6d69a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9148f778ce04136bab5385ac8bad6a9.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 在
中,点D,E满足
,
,且
.若
,则
的可能值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff400c098ae6bf6abd24651a5a21114e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122fe84cfa345c1902231699c96beac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb4e45a8255e2972a2be4aa09a458d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15569b0d31b0dff87c925d90c25ef5be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
10 . 如图,在
中,
,
,
,点
分别在
,
上且满足
,
,点
在线段
上,下列结论正确的有( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc09520fb9d0ddef3b11171fd14695c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11680d693115593736d86af0100aef98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/5d4bd08f-6ff9-4193-9225-086f6a0b5009.png?resizew=186)
A.若![]() ![]() |
B.若![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
您最近一年使用:0次
2023-05-22更新
|
937次组卷
|
3卷引用:山东省烟台市2023届高三二模数学试题