(1). Let f(x) = 
.Which of the following is true? Ans.__甲__
a. f(1)>0 b.f(5)＜0 c.f(2)＞f(4) d.f(2)＜f(4)
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(1). Let f(x) = .Which of the following is true? Ans.__甲__
a. f(1)>0 b.f(5)＜0 c.f(2)＞f(4) d.f(2)＜f(4)