[微分] 求函數及值範圍
設K為時數,且對任意時數X,不等式X^4-4K^X+12 >= 0衡成立,求K的範圍
經過審慎思考後我覺得他是在求函數凹口向上的範圍
所以
將X作一階微分後
函數為4X^3-4K^3>=0
爾後展開變成乘法公式
=>4(X-K)(X^2-KX+K^2)>=0
之後如何題目切入哇~各位高手~
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