如图所示,在△ABC中,点M是AB的中点,且
,BN与CM相交于点E,设
,
,试用基底
表示向量
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/266473bc1eccf74742fbed34bd9ec698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfca12290a98993f84d7ee4b8caaa9d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7ae4dd35c90a6da3c7f604ea0861af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2173a791f504749b01c97b951be4b940.png)
更新时间:2018-03-01 17:52:30
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相似题推荐
解答题-问答题
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【推荐1】如图,在四边形
中,
为等边三角形,
是边
上靠近
的三等分点.设
.
表示
;
(2)求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f35fd9eb737217de188c73ccb2998b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dfdbbc32d83b85bf7725dbb320ca09e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1bdac6f7cdf27f4c00c601e95492d2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
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【推荐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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【推荐3】如图,已知四边形
为平行四边形,
,
,设
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963830363881472/2965831132913664/STEM/dcca639dae904d12bc43836efe18aa49.png?resizew=340)
(1)用向量
,
表示
;
(2)若点P是线段CM上的一动点,
(其中
),求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245c24bc367dadfa17a54f98b6552af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793f22101b6f49e98e4e87def08a0585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291b593c5c12e80f6d66adddb24eb99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700bef006ad18f77fb3a8d43e58d4ba9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963830363881472/2965831132913664/STEM/dcca639dae904d12bc43836efe18aa49.png?resizew=340)
(1)用向量
![](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/e773bfc45764fd279a64990c98ccd61e.png)
(2)若点P是线段CM上的一动点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88466951d62b1a70f1925c5f7a041a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0868e3836ba2f9f76ed5be2a2106339.png)
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【推荐1】在如图所示的平面图形中,已知
,
,
,
,求:
![](https://img.xkw.com/dksih/QBM/2022/1/3/2892861288833024/2902935076577280/STEM/4204842dbe8e47d9a170aa2d76e357d9.png?resizew=263)
(1)设
,求
的值;
(2)若
,且
,求
的最小值及此时的夹角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9344303efb0541eb449d782ad2b488.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a69b7672cd2925271115062a9863a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f8f21d381992a01b2bc936b6d67ac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06d0c796f9b1362b4b310e9309b9892.png)
![](https://img.xkw.com/dksih/QBM/2022/1/3/2892861288833024/2902935076577280/STEM/4204842dbe8e47d9a170aa2d76e357d9.png?resizew=263)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526495142b12bda198adbe1360b6ac80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e22ff53d01c6a8e023d417caf7d946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeee4ab64a168c8c32701131f2c1b96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55708f75d975fe86c0d8b1acecfb5dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ddbb81b83d4021ca92aaffb4535ca0.png)
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【推荐2】如图四棱锥
中,
是以
为斜边的等腰直角三角形,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7b33f5a3-320c-449e-aa81-56fd64f1a604.png?resizew=181)
(1)求证:直线
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
与平面
所成角的正弦值.
(3)设
是
的中点,判断点
是否在平面
内,并证明结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d730ae4307db56b47849c3a19dedfb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87261df80b82221732329b6ef3fdda7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7b33f5a3-320c-449e-aa81-56fd64f1a604.png?resizew=181)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a20ea69475dcf57a5ff18c13eceaaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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【推荐3】如图,在直角三角形
中,
.点
分别是线段
上的点,满足
.
的取值范围;
(2)是否存在实数
,使得
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763bd8951bfb72d6a9bda823a29443b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955854f6017fde2eb09c734fcb6d6b8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b7f456b6f7fcced1b8dce00c2877cd.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505b99f3728b6b6e091ed55dfce36ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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