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(﹣∞,0) (0,+∞) (﹣∞,e4) (e4,+∞)
(﹣2,+∞) (0,+∞) (1,+∞) (4,+∞)
af(b)≤bf(a) bf(a)≤af(b) af(a)bf(b)
(-∞,0) (0,+∞) (-∞,e4) (e4,+∞)
af(b)≤bf(a) bf(a)≤af(b) af(a)≤f(b) bf(b)≤f(a)
af(b)≤bf(a) bf(a)≤af(b) af(a)≤f(b) bf(b)≤f(a)
af(b)≤bf(a) bf(a)≤af(b) af(a)≤f(b) bf(b)≤f(a)
f(x)在x=1处不可导 f(x)在x=1处可导,且f'(1)=α f(x)在x=1处可导,且f'(1)=β f(x)在x=1处可导,且f'(1)=αβ
af(b)≤bf(a) bf(a)≤af(b) af(a)≤f(b) bf(b)≤f(a)