名校
解题方法
1 . 如图,在直角三角形ABC中,
,
,
,
,
,其中
,
,设DE中点为M,AB中点为N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/e056c642-4570-4ee1-a6c3-9184732fa975.png?resizew=219)
(1)若
,求证:C、M、N三点共线;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f149e83812e72efd7dd3dfc78d0134ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2964fea2c107bbfd4a07fc97f4de5988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4b6c682d7b0741fb1f12a073394fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4fa6fce1a8d2a9c8f26fa82445ea8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44eb5d2938429659b5902a89be69f580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498f1dc84ac63d1c8b2e8a28f2bb54a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/e056c642-4570-4ee1-a6c3-9184732fa975.png?resizew=219)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a4480988244a9d04ec293975db2cc0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f371d431b6c91972b742c426c8a81ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084709e143b7574e8369e2902884ba92.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
名校
3 . 如图,在△ABC的边上做匀速运动的点D,E,F,当t=0时分别从点A,B,C出发,各以定速度向点B,C,A前进,当t=1时分别到达点B,C,A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/41dff433-a926-45f5-b16f-71f94aad79a6.png?resizew=153)
(1)证明:在运动过程中,△DEF的重心保持不变;
(2)若△ABC的面积为S,求△DEF的面积的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/41dff433-a926-45f5-b16f-71f94aad79a6.png?resizew=153)
(1)证明:在运动过程中,△DEF的重心保持不变;
(2)若△ABC的面积为S,求△DEF的面积的最小值.
您最近一年使用:0次
4 . 如图,M是矩形ABCD的边CD上的一点,AC与BM交于点N,BN=
BM.
![](https://img.xkw.com/dksih/QBM/2018/8/24/2017368819597312/2040094192181248/STEM/c4178d878232490cb8f7913966b7da17.png?resizew=173)
(1)求证:M是CD的中点;
(2)若AB=2,BC=1,H是BM上异于点B的一动点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0e7bfbd56fe73dfe04c04da749d942.png)
![](https://img.xkw.com/dksih/QBM/2018/8/24/2017368819597312/2040094192181248/STEM/c4178d878232490cb8f7913966b7da17.png?resizew=173)
(1)求证:M是CD的中点;
(2)若AB=2,BC=1,H是BM上异于点B的一动点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7837b6bb492ebf94d7cf3a70f57810.png)
您最近一年使用:0次