2012·陕西延安·模拟预测
名校
解题方法
1 . 在直角梯形
中,已知
∥
,
,
,
,
,若
为
的中点,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c552f7bc957eed6b29e76b1b556d2e9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 .
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e44311c2026af2e1a21722fe965ab3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-04更新
|
437次组卷
|
3卷引用:2016届陕西省高三高考全真模拟(五)考试数学(文)试卷
2013·陕西宝鸡·一模
3 . 已知
,直线
,
为平面上的动点,过点
作
的垂线,垂足为点
,且
.
(1)求动点
的轨迹曲线
的方程;
(2)设动直线
与曲线
相切于点
,且与直线
相交于点
,试探究:在坐标平面内是否存在一个定点
,使得以
为直径的圆恒过此定点
?若存在,求出定点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5899b11dbeffe6fe5cad8e2375d27d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7519e0e1e77101433a1d6a26f3d88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/e8a35b6cf7624b0eb7e424ae2df858a3.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/afa4ad15abe54a55b6201b2b00a92192.png)
(2)设动直线
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/b34bbea5d0014b9f95ea33303aaba25a.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/afa4ad15abe54a55b6201b2b00a92192.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/e987ef4b4169491aaeded0e8632d9714.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/972ad836b8684a54bcb6edfe9acceebe.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/bcc997f718494049b28f142b13af4044.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/607fe7c21b6845c6a429e5c7e33c2c3e.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/fa554ed48fa448bfa22bf0ce62ee3676.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/607fe7c21b6845c6a429e5c7e33c2c3e.png)
![](https://img.xkw.com/dksih/QBM/2013/6/24/1571250389770240/1571250395455488/STEM/607fe7c21b6845c6a429e5c7e33c2c3e.png)
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4 . 若
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2378f5496f783107ae8f4654d9046f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e75f56a8f80fbcbbc22b2d2bd500ab.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2013·山东临沂·一模
5 . 平面向量
与
的夹角为60°,
则![](https://img.xkw.com/dksih/QBM/2013/11/28/1571414184976384/1571414190481408/STEM/d3fb3ef9cac6400db6f840107aadf274.png)
![](https://img.xkw.com/dksih/QBM/2013/11/28/1571414184976384/1571414190481408/STEM/338271ee688e4caa926b328c881d1cab.png)
![](https://img.xkw.com/dksih/QBM/2013/11/28/1571414184976384/1571414190481408/STEM/8215b5d0cfc7411e96d11bc1966db1e0.png)
![](https://img.xkw.com/dksih/QBM/2013/11/28/1571414184976384/1571414190481408/STEM/e8fab800d5ce4630a5f234fde944c8ac.png)
![](https://img.xkw.com/dksih/QBM/2013/11/28/1571414184976384/1571414190481408/STEM/d3fb3ef9cac6400db6f840107aadf274.png)
A.![]() | B.![]() | C.4 | D.12 |
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12-13高二上·陕西西安·期末
6 . 已知向量
,若
,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea19eb514640da3650750f6ec5a4922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d76ee2e81f447f84a3e0b39c0388ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83634e314df24df73ae37d25a44d20e3.png)
您最近一年使用:0次
2014·全国·一模
7 . 如图,在△ABC中,BD=2DC.若
,
,则
=( )
![](https://img.xkw.com/dksih/QBM/2014/5/15/1571723251007488/1571723256496128/STEM/8d7485e75e5946a0b295db07bae34151.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2014/5/15/1571723251007488/1571723256496128/STEM/a7d686e304f94b50bad1092f16147b62.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2014/5/15/1571723251007488/1571723256496128/STEM/4e35fce22dc54b93b02eebf44ab58406.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2014/5/15/1571723251007488/1571723256496128/STEM/465c1af8299a46a99f36a277457d1147.png?resizew=18)
![](https://img.xkw.com/dksih/QBM/2014/5/15/1571723251007488/1571723256496128/STEM/8d7485e75e5946a0b295db07bae34151.png?resizew=152)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知点
是圆:
上的动点,点
,
,
是以坐标原点为圆心的单位圆上的动点,且
,则
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab653ffa6acf8b28096ff54719579d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa5694373bd78b1ca2180f831bf1c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2252dec4cf2fd59caff617269567806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b7e01c8145d0db8aaab7ad5bed9d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0417a0809f424529950cb5e0898a8f4a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-04更新
|
413次组卷
|
2卷引用:2016届陕西省高三高考全真模拟(五)考试数学(理)试卷
9 . 已知D是
ABC所在平面内一点,
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e033f67841bcb481db65d3ce495f0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13a6bbde5db87be8d2f091a37c19a2d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次