已知
的重心为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113986d9507fc5015e71989831c128b.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef927026c4217ff3b3bedda0520e162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113986d9507fc5015e71989831c128b.png)
更新时间:2021-05-10 08:16:55
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填空题-单空题
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解题方法
【推荐1】在平行四边形ABCD中,E是CD的中点,F是线段BD上的一动点,若
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed32af845a9420364bc65089bbffe48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b06ba5020b81316260eb7f904ab621.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/fcaeb2d5-c2f1-4adf-800a-d048de0159a1.png?resizew=203)
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【推荐2】在
中,O为中线
上的中点,若
,则
等于________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810fee760e06028fb7d37e65db79bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d4fea5a3b9e1e6a7311f95bde94b03.png)
您最近一年使用:0次
填空题-双空题
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【推荐3】如图,ABCD是一个梯形,
且
,M,N分别是DC,AB的中点,已知
,
,试用
表示下列向量.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/b0a29980-9f0b-4200-adcc-17bd2ecabb57.png?resizew=122)
(1)
=________ ;
(2)
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee64621edf9e26c76c983808201e2582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4a52497784666ffcbc66949bbcbcff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a60b8159d8bb2c7acefc46175d7f3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38563191959777495b5bf720c993bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111939547e581e8bf029a241b9e9cb05.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/b0a29980-9f0b-4200-adcc-17bd2ecabb57.png?resizew=122)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd4b9ad667f6da79bc3a5737cbc1eee.png)
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解题方法
【推荐1】已知平行四边形
中,
为
中点,点
为线段
上的一点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b981a38ddc94e2806871d7e8a17290d.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113dbc4f0bc689f0abb6f6f157ec4ead.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e284edfc390b322d0104817bd9aaa992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b981a38ddc94e2806871d7e8a17290d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113dbc4f0bc689f0abb6f6f157ec4ead.png)
您最近一年使用:0次
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【推荐2】在平行四边形ABCD中,E为线段CD的中点,
,
,其中
,且均不为0.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd88c52ee21f07b7dad1a351e54b3ba5.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68518e208f3db53e37c265f4943919d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a330b6de38b7ef2933726d717b2b6d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ab4b75fa22deba7fcbcdcb31dd45b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0440f82f1344e0c04ebc467e871a409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd88c52ee21f07b7dad1a351e54b3ba5.png)
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