设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1 ,证明函数f(x)在x=0处可导且取得极小值.
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设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1,证明函数f(x)在x=0处可导且取得极小值.设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1,证明函数f(x)在x
设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1 ,证明函数f(x)在x=0处可导且取得极小值.
设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1 ,证明函数f(x)在x=0处可导且取得极小值.
设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1 ,证明函数f(x)在x=0处可导且取得极小值.
f(x)在x=0处的导数为f‘(0)=lim(x趋于0)[f(x)-f(0)]/x
因为f(x)在x=0连续,且lim(x趋于0)f(x)/x^2=1,所以f(0)=0
lim(x趋于0)[f(x)-f(0)]/x=lim(x趋于0)f(x)/x
lim(x趋于0)f(x)/x^2=1,说明f(x)在x=0处于x^2是等价无穷小
所以lim(x趋于0)f(x)/x=lim(x趋于0)x^2/x=x=0,证明f(x)在x=0可导,切f ’ (x)=x
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设f(x)在x=0处连续,且lim(x趋于0)f(x)/x^2=1 ,证明函数f(x)在x=0处可导且取得极小值.
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