解题方法
1 . 如图,
为
的重心,
分别为
上的动点,且线段
经过点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e7170bb4a2ddcef39391a06c989162.png)
![](https://img.xkw.com/dksih/QBM/2021/4/6/2693988590878720/2800775601700864/STEM/3bd9a62e-2c61-4241-a825-a7a44d4bf576.png?resizew=285)
(1)若
,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66ba239cbf38596abf32bfbedf66afd.png)
(2)若
,求
的最小值及取最小值时
与
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e7170bb4a2ddcef39391a06c989162.png)
![](https://img.xkw.com/dksih/QBM/2021/4/6/2693988590878720/2800775601700864/STEM/3bd9a62e-2c61-4241-a825-a7a44d4bf576.png?resizew=285)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7dbaf678b4994d3f9464e31b87dbb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66ba239cbf38596abf32bfbedf66afd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462caa57f8e387189476b032e10926d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79dd1b99a422eebcf5ce1568a84aae33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b5a51e65e9b56a9970de33ead263a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d792a2aa25763e14cc2863be3887000.png)
您最近一年使用:0次
2021-09-04更新
|
244次组卷
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2卷引用:云南省南涧县第一中学2020-2021学年高一4月月考数学试题
名校
2 . 在
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/31dba94c-f9a4-4bd0-9de7-a24ee41802a3.png?resizew=442)
(1)如图1,若
在
上,且为靠近点
的四等分点,且
,求
;
(2)如图2,
,
,
,
,
分别为
上的2021个点,且满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f412528e223f268ec4f0f3e268ced80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/31dba94c-f9a4-4bd0-9de7-a24ee41802a3.png?resizew=442)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57766a96c4b7e39bc224fa5917c6be22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f29d5f376c75c41ae6af0c8a8565449.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee7bb49247387a9028602315729f8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7beada0668454b2cd7713cc3a520f0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42915c926f95d1b6b042d6f961fdf620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f335211fe4a99a7ea20b0fe54ba13f6e.png)
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