1 . 已知
的面积为
,且
.
(1)求
;
(2)若点
为
边上一点,且
与
的面积之比为1:3.
①求证:
;
②求
内切圆的半径
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f42512944bb6478f06cdee50aa82ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eecc8c02ff3d06d7f31b313623da6c7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62f140d8587e6e35e01da1bbdefc53e.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba47906b1c55990f2c0ca31d656b774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba47906b1c55990f2c0ca31d656b774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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2017-02-08更新
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5卷引用:2017届江西抚州七校高三上期联考理数试卷