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(﹣∞,0) (0,+∞) (﹣∞,e4) (e4,+∞)
f(1)≤f(x)≤f(2) f(x)≤f(1) f(x)≥f(2) f(x)≤f(1)或f(x)≥f(2)
f(0)+f(2)2f(1) f(0)+f(2)2f(1) f(0)+f(2)>2f(1) f(0)+f(2)2f(1)
f(x)≥f(a) f(x)≤f(a) f(x)>f(a) f(x)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1) f(0)+f(2)>2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1) f(0)+f(2)>2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)£2f(1) f(0)+f(2)³2f(1) f(0)+f(2)>2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1) f(0)+f(2)>2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1) f(0)+f(2)>2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)>2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1)
af(b)≤bf(a) bf(a)≤af(b) af(a)bf(b)
(-∞,0) (0,+∞) (-∞,e4) (e4,+∞)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)>2f(1) f(0)+f(2)≥2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)>2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1) f(0)+f(2)>2f(1)
af(b)≤bf(a) bf(a)≤af(b) af(a)≤f(b) bf(b)≤f(a)
f(0)+f(2)<2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)≥2f(1) f(0)+f(2)>2f(1)
f(0)+f(2)<2f(1) f(0)+f(2)£2f(1) f(0)+f(2)³2f(1) f(0)+f(2)>2f(1)
f(x)≥f(a) f(x)≤f(a) f(x)>f(a) f(x)
af(b)≤bf(a) bf(a)≤af(b) af(a)≤f(b) bf(b)≤f(a)