1 . 设
.则
的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9428a524348c40b8eb625b3c7146b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30797d9e11d1d870937642441ed9b351.png)
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2 . 设
、
、
.证明:
.
![](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/7ed1fce746288fbe29cb86048b23ce97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a67a9b11b2b384572eff65fd21b80a.png)
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3 . 证明:对任意给定的正数
,存在正数
,使得对任意满足条件
的正实数
、
、
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56667aabbe787eb1c3189d487d203e22.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/f571fd3e36c0bf1e9386e7275358c436.png)
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4 . 已知a,b,c∈R,且3a2+3b2+4c2=60.
(1)求 a+b+c的最大值
(2)若a,b∈(0,4),c∈(0,6),求
的最小值
(1)求 a+b+c的最大值
(2)若a,b∈(0,4),c∈(0,6),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8295a364200d1c0a6b54dd7985b55c0.png)
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5 . 已知存在整数
,使得
,求所有可能的
的值及相应的整数解
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9016dc7bc5689aaca108ace6964c7bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e04ec597487bd7da544f1371b479d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57bfff3d191a90414aa2f318c5e9f40b.png)
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6 . 已知数列
满足
,
满足
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f03b77511b764dd3f60b53a382f9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d474d8944c27ccc71fbae10f0317deb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f91b33d881d2a0a6b13618be4a44241e.png)
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7 . 设
.求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc260fc5103365c1e6ca4a52caa8fdf.png)
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042a7833780a0b2df756e393a50b44a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc260fc5103365c1e6ca4a52caa8fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d65080868a4b05ed951302390560c8.png)
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8 . 给定正数
、
,对
、
,且
.则
的最小值为______ .
![](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/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800979356d015aaf5772c4334f31e5ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db92a10a04cdd1b1d81966243744993.png)
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9 . 已知同心圆
与椭圆
有公共点.求半径R的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3311792d8021cce363cea15edae9fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f4b244b3b0799cfb1994364036eb1.png)
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10 . 设
、
、
是正实数.证明:
,其中,“Σ”为轮换对称和.
![](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/62c46116b6d3db74a9dc2a4a4f172069.png)
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