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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)
(-∞,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)
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)
f(0)+f(2)>2f(1) f(0)+f(2)≤2f(1) f(0)+f(2)<2f(1) f(0)+f(2)≥2f(1)
[1,2] (0,1/2] [1/2,2] (0,2]
fs≥2fx fs≥fx fs≤fx fs≤2fx