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[函数] 函数小题

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大佬最帅 posted 2021-11-26 22:42 |Read mode
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感觉不太好写

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kuing posted 2021-11-26 23:22
题目又没有复杂公式,为啥不打字而贴图呢?

只要证明有根即可,设 f(x) 在 x=a 处取最小值,在 x=b 处取最大值,令 g(x)=f(x)-f(x+L),则 g(a)<=0, g(b)>=0,故 g(x) 在 [a,b] 内有零点。

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isee posted 2021-11-26 23:49
回复 2# kuing

肯定是没学会公式了,哈哈哈哈哈哈哈

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isee posted 2021-11-27 00:01
题目又没有复杂公式,为啥不打字而贴图呢?

只要证明有根即可,设 f(x) 在 x=a 处取最小值,在 x=b 处取最 ...
kuing 发表于 2021-11-26 23:22
还要“说”下连续周期函数必有界吧?
直接考虑 $[0,T]$ 这个闭区间?

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kuing posted 2021-11-27 02:14
回复 4# isee

嗯,嗯。

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