解题方法
1 . 情境 我们应该熟悉如下结论:已知A,B,C,O为平面内不同在一条直线上的四点,则A,B,C三点在一条直线上的充要条件是存在一对实数m,n,使
,且
.
问题:怎样证明上述的结论呢?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf70bea052340ba45486fbf66450d1cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f371d431b6c91972b742c426c8a81ef.png)
问题:怎样证明上述的结论呢?
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2 . 如图,在长方形
中,E为边
的中点,F为边
上一点,且
.设
,
.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938674037768192/2940499691495424/STEM/aa9a17055f144feea5a7b0c8f154ad8e.png?resizew=189)
(1)试用基底
表示
,
;
(2)若
,求证:E,G,F三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571662e11cff4b9a48a3cdf8704977d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b536ac375a0b74e9c7efbc585f987f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4abd10ab43ce90743bd0f79b1f5bfc.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938674037768192/2940499691495424/STEM/aa9a17055f144feea5a7b0c8f154ad8e.png?resizew=189)
(1)试用基底
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e22c0e0b78ae0ce1a0fb6ca107f6658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2173a791f504749b01c97b951be4b940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1307cc4692a34308f7e534e56882b76f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e56a5768de5478030b88d058a841ad.png)
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2卷引用:重庆市第八中学2021-2022学年高一下学期第一次月考数学试题
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3 . (1)如图,
,
不共线,
是直线
上的动点,证明:存在实数
,
,使得
,并且
.
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965894555860992/2967921927028736/STEM/1cb3760a-d6bf-42c6-8e0c-e520bd49157b.png?resizew=144)
(2)用向量法证明下列结论:三角形的三条中线交于一点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b0ab2519d0fb666743993961daee47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86ae785512262461ee99e1a724f4f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6096acdd2d0ce16e1e45397ec5e365d4.png)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965894555860992/2967921927028736/STEM/1cb3760a-d6bf-42c6-8e0c-e520bd49157b.png?resizew=144)
(2)用向量法证明下列结论:三角形的三条中线交于一点.
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4 . 已知平行四边形ABCD,
,AD⊥BD,E、F分别为AC上2个三等分点.
=
,
=
,|
|=1.,判断DE、BF的位置关系并用向量方法加以证明,求
的值
(2)已知A(1,1),B(5,1),求D点坐标及
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c5ae3525aa482c821f7c2402cdb0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa5e480dbb1503156d66b30f0e4e4e9.png)
(2)已知A(1,1),B(5,1),求D点坐标及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5042ed4b58d540d0120f8019f29f3f.png)
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解题方法
5 . 探究与实践告诉我们:平面上不共线的三个点O、A、B,对平面上任意一点P,都有实数
与
,使得
,且A、B、P三点共线的充要条件是
.已知
中,过重心G的直线交线段AB于P,交线段AC于Q,设
的面积为
,
的面积为
,
,
.根据阅读材料的内容,解决以下问题:
(1)求证:
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bca4c0ab83a3ca3b0ebf03281be74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6096acdd2d0ce16e1e45397ec5e365d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fbb44c49976c1a07daf42a8df29480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb28dd61871a296ec19e7b6028774a6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7aaba80aaeefc1d254e81cd4512d91.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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解题方法
6 . 已知
中,点E,F分别在边AB,AC上,且满足
,连接BF,CE,交点为P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/1b1576d3-67b2-4e28-b0d4-37dbd3193121.png?resizew=254)
(1)当点P为
的重心时,求m,n的值;
(2)当
时,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e078206130cd30f3de25cf2ede851d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/1b1576d3-67b2-4e28-b0d4-37dbd3193121.png?resizew=254)
(1)当点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc899d37ace8055007a36c26703daa2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef93b777f548aad8e3f5a0973928366d.png)
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7 . 如图,平行四边形ABCD中,
.
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946577665048576/2948635542429696/STEM/003c8521-a03f-4968-a374-e5ebccebb23e.png?resizew=187)
(1)若
,E为AM中点,求证:点D,E,N共线;
(2)若
,求
的最小值,以及此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d58684e59bd0cbf2d59589fcd5baa9.png)
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946577665048576/2948635542429696/STEM/003c8521-a03f-4968-a374-e5ebccebb23e.png?resizew=187)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ef664c0aedbd692693ea4a376fa9f4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30657d2a85e16c8f38f97e45ab1ac5ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c995e7d79ebfc21814113ae1b15c8569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c7127e3ffa52e588c100d8e6c70f40.png)
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5卷引用:山西省运城市2021-2022学年高一下学期3月阶段性检测数学(A)试题
20-21高一·全国·课后作业
8 . 设
,
是平面内的一组基底,
,
,
,求证:B,C,D三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a51625aa29680efa0e12c1584388ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8604f9320fb0b70858342cafc0d0f1cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e823a73e04d75305c59ef5addeb4ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe97badb66f0f6b9bbea2ab41ecf376f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33efad61b6740de0af50cb45a574ebcc.png)
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解题方法
9 . 设两个非零向量
与
不共线.
(1)若
,
,
,求证:
,
,
三点共线;
(2)向量
与
的夹角
,且
,
,求
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fabf836a5eb2105f5a32160b75640c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3919c74b50641196033aa756ac2dd3d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d8fbf3fb296a64537058cced36e1c7.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/8455657dde27aabe6adb7b188e031c11.png)
(2)向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd15ead753cf2927f51d07c7727c6cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9936a46cc891744d4600f76bb92b694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082c6926889f84f438ea35f70bf05f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
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2卷引用:福建省三明市三地三校2020-2021学年高一下学期期中联考数学试题
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解题方法
10 . 如图,在边长为1的正△ABC中,E,F分别是边AB,AC上的点,若
=m
,
=n
,m,n∈(0,1).设EF的中点为M,BC的中点为N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/3421342d-9d53-41b5-a727-590904a9afb4.png?resizew=186)
(1)若A,M,N三点共线,求证:m=n;
(2)若m+n=1,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd0cecf5c102254b9755e42a80c3948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b8a2a41a8b50e10d68943e3f0f4e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/3421342d-9d53-41b5-a727-590904a9afb4.png?resizew=186)
(1)若A,M,N三点共线,求证:m=n;
(2)若m+n=1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfe64604ee828d439929c94c205c51c.png)
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