1 . 凸四边形
的边
的中点分别为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65cca849a71bae840993bd051994db3e.png)
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2 . 已知两个向量
,求证:若
,则
的方向与
的方向垂直,反之也成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11042e4d0e1a076a9a5a6b2611db5256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://img.xkw.com/dksih/QBM/2016/12/26/1619407376867328/1619407377285120/STEM/a606526243b4413fa14866a167db74af.png)
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解题方法
3 . 设在平面内给定一个四边形
,
分别为
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f758a811b8a2c260431aa7e6a4060987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabd34cc1dd98500753380a223d5f7c8.png)
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4 . 已知向量
为非零向量,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef84d275246c94cd7d9c983231210fd.png)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
(2) 若
,求
与
的夹角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef84d275246c94cd7d9c983231210fd.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
(2) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a6325f466f657dde9cf7233a4fa638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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5 . 如图,在直角坐标系
中,已知圆
:
.点
,
在圆
上,且关于
轴对称.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572677414502400/1572677420720128/STEM/2e0941d90f674b4ebd321480aa7d81b0.png)
(Ⅰ)当点
的横坐标为
时,求
的值;
(Ⅱ)设
为圆
上异于
,
的任意一点,直线
,
与
轴分别交于点
,
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572677414502400/1572677420720128/STEM/2e0941d90f674b4ebd321480aa7d81b0.png)
(Ⅰ)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3e3605afb6682257901f4358cb820a.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf124229df3d968f31343f38f513abfe.png)
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6 . 已知过点A(0,1)且斜率为
的直线
与圆C:
相交于M、N两点.
(1)求实数
的取值范围
(2)求证:
为定值
(3)若O为坐标原点,且
,求K值.
![](https://img.xkw.com/dksih/QBM/2015/2/4/1571975398850560/1571975404519424/STEM/b7efc9d0982e4ccc822471b573523742.png)
![](https://img.xkw.com/dksih/QBM/2015/2/4/1571975398850560/1571975404519424/STEM/bd8e8a69cd1b40818e460a3832c60e3b.png)
![](https://img.xkw.com/dksih/QBM/2015/2/4/1571975398850560/1571975404519424/STEM/13d64e25301b42a7baefd3f2d7d0fb6a.png)
(1)求实数
![](https://img.xkw.com/dksih/QBM/2015/2/4/1571975398850560/1571975404519424/STEM/b7efc9d0982e4ccc822471b573523742.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2015/2/4/1571975398850560/1571975404519424/STEM/e4bc370fe1394756bd90048b0ab1e0df.png)
(3)若O为坐标原点,且
![](https://img.xkw.com/dksih/QBM/2015/2/4/1571975398850560/1571975404519424/STEM/b61380d6eff04ba8bbaf8a65ce4d01d6.png)
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解题方法
7 . 已知椭圆
的右焦点为
,
为短轴的一个端点,且
,
的面积为1(其中
为坐标原点).
![](https://img.xkw.com/dksih/QBM/2016/1/13/1572433593655296/1572433599807488/STEM/79da0cf4c917401e89e201a9aab5f304.png)
(1)求椭圆的方程;
(2)若
,
分别是椭圆长轴的左、右端点,动点
满足
,连接
,交椭圆于点
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ec56b59d6f2654570c2b5c4fd13a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070cc75712a7a5380b378dc662715cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e922914734ef216cc4e43876bd4370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2016/1/13/1572433593655296/1572433599807488/STEM/79da0cf4c917401e89e201a9aab5f304.png)
(1)求椭圆的方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b8a53e62589194366be7a831a5fc4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b812563c720022bc08c33f729bfcd8.png)
您最近一年使用:0次
2016-12-04更新
|
1352次组卷
|
5卷引用:2015-2016学年浙江省慈溪中学高二上期中数学试卷
8 . “坐标法”是以坐标系为桥梁,把几何问题转化成代数问题,通过代数运算研究图形的几何性质的方法,它是解析几何中是基本的研究方法. 请用坐标法证明下面问题:
已知圆O的方程是
,点
,P、Q是圆O上异于A的两点.
证明:弦PQ是圆O直径的充分必要条件是
.
已知圆O的方程是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
证明:弦PQ是圆O直径的充分必要条件是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdcad3b7a9bbb95bd573a6124b05226.png)
您最近一年使用:0次
2016-12-03更新
|
325次组卷
|
2卷引用:2014-2015学年内蒙古赤峰市宁城县高二上学期期末考试理科数学试卷