解题方法
1 . 已知
,
,且
,下面选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867615f26578c7d01c3e484d39c4996a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023aa2bc1555f043aba66da1687b1e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff6dcc389a1f5d6cf1d877168ad157f.png)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2 . 在
中,
,
,若点
分别为
上的点,且
为等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/b1e15c51-25b8-4f55-b65b-5050fe2d8358.png?resizew=134)
(1)若点
为线段
中点,求
的边长;
(2)若点
为线段
上一动点,求
面积的取值范围.(提示:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350d9f16e66c2bf7e8e3c7dd6418e639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9913530cd12116a0dab253ebf9d935de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5b88ec996d2d117987e7303cefe4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4a91526aaa01560e47867b3bd9f9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/b1e15c51-25b8-4f55-b65b-5050fe2d8358.png?resizew=134)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bfb682867fa062b43dd793da041c56.png)
您最近一年使用:0次