已知
是不共线的三点,且
满足
,直线
与
交于点
,若
.
(1)求
的值;
(2)过点
任意作一条动直线交射线
于
两点,
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f5e21d225bf3c159ddf3876fbb8fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d651eb2a890fd91d49e8f36a13f8b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e06ca53803f042a5eca99f56a70f05e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a5e484dfef494d27bc35ae7b8cf75d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5381f952daa8f010cada233f1ccc34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
更新时间:2023-10-09 21:46:53
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解答题-问答题
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较难
(0.4)
名校
解题方法
【推荐1】如图,在
中,设
,
,
,
,
,
,
,
与
交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/5633ae03-bed8-45f8-8c9b-fccedae63328.png?resizew=160)
(1)求
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e69148daeb9cc63a07b1018f7107c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fed0e4135ea42366959e4e305bd7d3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7c3d0b3ed43eb01ebf5272aef2a24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acd69f9a7b4f4b7176eba8a2388631c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/5633ae03-bed8-45f8-8c9b-fccedae63328.png?resizew=160)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c174f127b7234ebb6a87d9185bd2210.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079aa96bb18e4340c71bac10ad937389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】如图,
为
的中线
上的点,且
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的直线分别交
,
两边于点
,
,设
,
,请求出
,
的关系式,并记
.
![](https://img.xkw.com/dksih/QBM/2022/6/24/3008420752056320/3010629357903872/STEM/a49a7ae0f17d485e8dd41e0c867fdcd4.png?resizew=272)
(1)求函数
的表达式;
(2)设
的面积为
,四边形
的面积为
,且
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a291f84ab0281024c318dd9805831544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42283f40f5ba3d7047f2c65dc7695f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731d129699750d6d5f79a72e3444e96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐1】在等腰梯形ABCD中,
,
,
,
,
,动点E,F分别在线段BC和DC上(不包含端点),AE和BD交于点M,且
,
.
(1)用向量
,
表示向量
,
;
(2)求
的取值范围;
(3)是否存在点E,使得
.若存在,求λ;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d03acb29a5812acad760d564d6c84be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe419cc85c1801f6f1e9ec1d2682865.png)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a7f07db2ec637baadf8f0ab91c85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d021a5c98388463d577675e58068aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c3accb1b8a5479439beff4259660e3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7042c22468919ac8279ee70f25bd716.png)
(3)是否存在点E,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0063b15ff38b206337b587935ada99f0.png)
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【推荐2】如图,在△ABC中,
,满足
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/0918e902-1e9e-4a89-8250-cfbb22fd1f17.png?resizew=149)
(1)求λ与μ的关系式;
(2)若存在唯一实数λ,使得
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d81d732204a3c2384a27606f858677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1d5e60c0292f37fa6309d2b302a675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600ca92bd4b35b6b933481e8d495adde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807aad286d7dd205f731a9eee270f0fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/0918e902-1e9e-4a89-8250-cfbb22fd1f17.png?resizew=149)
(1)求λ与μ的关系式;
(2)若存在唯一实数λ,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505b99f3728b6b6e091ed55dfce36ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051d924d6f6d127d881d357ce1cc4207.png)
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