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[不等式] 四元不等式证明

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guanmo1 Post time 2015-4-16 11:41 |Read mode

如图

不等式.png

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kuing Post time 2015-4-16 12:38

《数学空间》2011年第3期P31~32例3.2.7

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其妙 Post time 2015-4-19 21:24

变式训练：
若$a+b+c+d=4$，$a^2+b^2+c^2+d^2=7$，求$a^3+b^3+c^3+d^3$的取值范围，

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其妙 Post time 2015-4-25 16:01

回复 3# 其妙
可以当成练习题玩玩

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