1 . 半径为
的球的内接三棱锥的体积
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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2 . 求出所有正整数
,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df96990c5f50b55ef276c060441c6b11.png)
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3 . 半径为
的圆的内接三角形的面积的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
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4 . 设
分别为长方体的对角线与共顶点的三个侧面所成的角.则
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da837806c2ff041e56b9bacd3ef41eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3d933c0633f58a2268e692d888faf5.png)
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5 . 甲、乙两人做游戏.甲随机选定一个正整数对
,乙做如下操作:将
分成
段,
,对每个整数
,取
或
,得到
.若
,则甲胜;若
,则乙胜.求甲胜的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f79244ef3cc17f2f1db7281b8494643b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e11aea45e1534adc03c7b59e8bd742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50139bc4272ae169ef42d275dfa4121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3802da062e7c11bba7e7700cf560c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f47a9ad83c803fac06b9ac0388b035c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6f2a7e44e312e319b5911f92ca9d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80eba938ab340e97aebbebbd44e7230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded839d68654ebc82984ed898e6c2c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd18c68d1526d505f167ad80270d720.png)
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6 . 已知
、
、
是
的三边长,且满足
,其中,“
”’“
”分别表示循环和、循环积.试判断
的形状.
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c620c5f4d973ca6b022b9e733bf75ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cf3fa0d9e0ed167bc03b43f3de24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5c617fc1b1d54cd910a24823e58af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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7 . 给定整数
,设
,
,且
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527093b2ec760913d0dccff8a099248b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a62270b738de1db19cf3dc749c52bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856b137a34d2d5b20671b7a3c7a29606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deffbcb0165f1a90a435d50118a14b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198ff6a0283e643b945589450d5723d5.png)
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8 . 已知
,且
,这里
.
(1)当
单调且
时,求f的值域:
(2)当
为任意实数
,求此时f的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5273a3a32c14d925d5024f7e1e715531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c6fef56f0c4cc70aad1b5629e34ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f1957a83a81f5a00c4cc4656189402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bbc31ae3ce3934f677dd621f72df9b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6d45616f0387fead755616ea5b340b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4afaaca79fb6efefaabb003c19a7638.png)
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