名校
解题方法
1 . 已知A,B,C是三个不同的点,
,
,
.
(1)求证:A,B,C三点共线;
(2)已知
,
不共线,若
,求
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae65544cc2f996bd435486caa601c4ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658895564427dd121170954d4f680938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180e713dc50acd364b26f71d0961ff2c.png)
(1)求证:A,B,C三点共线;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b610db358acc2aff4c9d6ae99aec94e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a9b297a174b05dff17e85c082139e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
名校
2 . 如图,在
的边上各自做匀速运动的点D,E,F,当
时分别从点A,B,C出发,以各自的 定速度向点B,C,A前进,当
时分别到达点B,C,A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/ef2d4b5f-0f3c-4fac-8d1b-0b38bda26f6f.png?resizew=142)
(1)证明:在运动过程中
的重心保持不变;
(2)若
的面积为S,求
的面积的最小值
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/ef2d4b5f-0f3c-4fac-8d1b-0b38bda26f6f.png?resizew=142)
(1)证明:在运动过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6f083d01de5d6212394f67dc517e20.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d336e14788f6f1d303b06965b19f94.png)
您最近一年使用:0次
2021-03-23更新
|
363次组卷
|
3卷引用:天津市南开中学2020-2021学年高一下学期3月月考数学试题