已知函数f(x)=x2+4lnx. (1)求函数f(x)在[1,e]上的最大值和最小值; (2)证明:当x∈[1,+∞)时,函数八戈)的图象在g(...

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问题 已知函数f(x)=x2+4lnx. (1)求函数f(x)在[1,e]上的最大值和最小值; (2)证明:当x∈[1,+∞)时,函数八戈)的图象在g(x)=2x3的图象的下方。
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