的凹区间是() - 高等数学(一)(00020) - 专业知识收录平台"> 的凹区间是() - 高等数学(一)(00020) - 专业知识收录平台">
的凹区间是()
A.(0,+∞)
B.(-1,+∞)
C.(-∞,+∞)
D.(1,+∞)
正确答案是B
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