解题方法
1 . 若
是边长为1的等边三角形,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4995ec65d0748dfeedc9068e0a5f2c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4995ec65d0748dfeedc9068e0a5f2c.png)
您最近一年使用:0次
2021-05-19更新
|
910次组卷
|
5卷引用:陕西省榆林市定边县第四中学2023-2024学年高三上学期第二次月考文科数学试题
解题方法
2 . 在
中,若
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfeaf26f178031f78a5545233a2a73f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d001af9125fda3eedd6f7d594feb0c.png)
A.3 | B.8 | C.4 | D.28 |
您最近一年使用:0次
解题方法
3 . 八卦图衍生自中国古代的《河图》与《洛书》,伏羲根据燧人氏造设的这两幅星图所作.在早期道教发展的历程中,八卦是一个不可或缺的因素.传说,伏羲曾造出先天八卦流于后世.后来,周文王演绎先天八卦,认为其中还有很多缺陷,做出了新的八卦图,人称后天八卦.如今我们流传的八卦图就是周文王推演的后天八卦.八卦图的模型如图1,若记中间的圆心为O,外围的正八边形的顶点顺次为ABCDEFGH(如图2),若
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/04253eb1-b643-490d-bf7f-8d8540238307.png?resizew=328)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fbeb2f1f6ee7279885520d889bfc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a969047e8bc59142bcc55614848b9104.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/04253eb1-b643-490d-bf7f-8d8540238307.png?resizew=328)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
4 . 已知向量
与
的夹角为120°,且
,
,若
,且
,则实数
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6b76b84f59139b6b11f010498b2bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120c06df591bd172e244b8939a9d4f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49acee3c19513ec7725415a82240da76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca70455cccedbd83ea4d941f7002be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-05-25更新
|
283次组卷
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4卷引用:2020届陕西省榆林市高三第三次模拟数学(文)试题
2020届陕西省榆林市高三第三次模拟数学(文)试题2020届陕西省榆林市高三第三次模拟数学(理)试题(已下线)文科数学-6月大数据精选模拟卷04(新课标Ⅰ卷)(满分冲刺篇)(已下线)理科数学-6月大数据精选模拟卷04(新课标Ⅰ卷)(满分冲刺篇)
名校
5 . 如图,抛物线
和圆
,直线
经过
的焦点
,依次交
于
四点,则
的值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8a3bffe545af2299cf999d44767206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72919fc0b5ee1116cf74d897c1d778b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e9feabc99f62ee569b460e61526e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde8ed3170ec317be8986296b1ea3676.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/6dfedc68-8037-4bf1-8fb2-aefb2b26e7bc.png?resizew=145)
您最近一年使用:0次
2020-02-07更新
|
377次组卷
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3卷引用:2020届陕西省榆林市高三模拟第一次测试理数试题
名校
6 . 已知向量
,
满足
,
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b377eb717740840940611b75babe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac261de257da87b01d2cd50e82dd0d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777a1cd28259416bf97b9bd07da1e590.png)
A.2 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-03-22更新
|
777次组卷
|
2卷引用:陕西省榆林市第一中学2019届高考模拟考试文科数学 试题
7 . 如图,已知平行四边形
中,
,
,
为线段
的中点,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862de06e8bf1a4562d68c8fcc13facde.png)
![](https://img.xkw.com/dksih/QBM/2017/11/13/1816386194186240/1817089475731456/STEM/668cad3521d645369cc77f8e0ce4d2cd.png?resizew=151)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862de06e8bf1a4562d68c8fcc13facde.png)
![](https://img.xkw.com/dksih/QBM/2017/11/13/1816386194186240/1817089475731456/STEM/668cad3521d645369cc77f8e0ce4d2cd.png?resizew=151)
A.![]() | B.2 | C.![]() | D.1 |
您最近一年使用:0次
2017-11-14更新
|
528次组卷
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2卷引用:陕西省榆林市第二中学2018届高三上学期期中考试数学(理)试题
解题方法
8 . 如图,在正方形
中,
,
为
上一点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba209a52ba69335ae5c3ff8a6a84e3c.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d314368f0e6620d1e9271d6266aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba209a52ba69335ae5c3ff8a6a84e3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/2606e48d-8933-458d-a803-40f416be66a1.png?resizew=120)
您最近一年使用:0次
2016-12-04更新
|
499次组卷
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4卷引用:陕西省榆林市定边县第四中学2023届高三上学期10月月考理科数学试题