解题方法
1 . 已知对于任意实数
、
,都有
,特别地,当
、
都为正数时,有
.
(1)已知
,求
最小值为______.
(2)已知
,求
最大值为______.
(3)
都是正数,
,求
最小值.
![](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/775da52de420f9cb8576daae625b0435.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/689f982af451283289255c87593ec338.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41f43df49b4c71f0bdaf6420a06eb28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7c0b6e87ff768d100e8a8f2a0b2eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3124e300e0d08374ac7de2a45b04c2.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82507c7fab925b91b523dc460070977b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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解题方法
2 . 已知半径为2的半球面碗中装有四个半径均为r的小球,碗壁和球的表面都是光滑的,且每个小球均与碗口平面相切,则r的值为___________ .
您最近一年使用:0次
3 . 设
,
,若
,则
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85319a950bf16b9388aa81a5b36b67e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf27b31754829c0e8317cc065b818375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c6c0a39713d7a6e5a7632a9baca161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
您最近一年使用:0次