1 . 我国古代数学家贾宪在解决勾股问题时使用了抽象分析法,他提出了“勾股生变十三图”.十三名指勾(
)、股(
)、弦(
)、股弦较(
)、勾股和(
)、勾弦和(
)、弦和和(
)等.如图,勾(
)、股(
)、弦(
)中,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5863400ba918d2714abc8df541a979.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce146eab6c3cf0f2a99f83434ac8260c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa17a39f52e09981729af4439ca535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9908f6beffd89c65e967112369fe4c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8641de131e86041bb4cee948569cdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dcdf048e907e670072f1070c8a8b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5863400ba918d2714abc8df541a979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce146eab6c3cf0f2a99f83434ac8260c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/f62d8915-88a5-4c1a-989e-84fa2370e8e6.png?resizew=195)
您最近一年使用:0次
解题方法
2 . 选修4-5:不等式选讲
(1)设
,证明:
;
(2)已知
,证明:
.
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94aa428b8f14ca9cefe41eb4e44244fc.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2acd1e0e18c3be37a458b8e35811f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b0673c08a4b6b58811d0b68c4daf2.png)
您最近一年使用:0次