设f(x)在[a,b]上连续,在(a,b)内可导,且f(a)=f(b)=0试证:在(a,b)内至少存在一点δ使得f(δ)+f'(δ)=0
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设f(x)在[a,b]上连续,且a
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【50分高数微积分题】设f(x)在[a,b]上连续,在(a,b)内可导 f(a)f(b)>0 f(a)f[(a+b)/2]