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[不等式] 不等式菜鸟一题

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guanmo1 Posted 2014-2-12 20:38 |Read mode

如图

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kuing Posted 2014-2-12 20:57

\[\frac{x_1}{1+x_2+x_3+\cdots +x_n}=\frac{x_1}{2-x_1}=\frac2{2-x_1}-1,\]
下略

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Author| guanmo1 Posted 2014-2-12 21:02

知道了，谢谢，接下来柯西。

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其妙 Posted 2014-2-13 00:07

回复 3# guanmo1
接下来也可以切线，只是太麻烦、
接下来还可以配均值，

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