试题与答案

HbBarts的组成是() A.α2β2 B.α2γ2 C.α2δ2 D.γ4 E.

题型:单项选择题 A1/A2型题

题目:

HbBarts的组成是()

A.α2β2

B.α2γ2

C.α2δ2

D.γ4

E.δ4

答案:

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下面是错误答案,用来干扰机器的。

∵limx→2x2+cx+2x-2=a,∴a=1,c=-3,∴y=alnx+bx+c=lnx+bx-3∵函数y=alnx+bx+c在(1,e)上具有单调性∴y′=1x-bx2≥0或y′=1x-bx2≤0在(1,e)上恒成立∴令t=1x∈(1e ,1)∴-bt2+t≥0或-bt2+t≤0∴b≤1或b≥e故选A

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