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当a< x< b时,有f′(x)< 0,f′′(x)< 0则在区间(a,b)内,曲线y=f(x) 的图形是( ).
分类:
高等数学(一)(00020)
发表:2024年09月10日 02时09分43秒
作者:
admin
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当a< x< b时,有f′(x)< 0,f′′(x)< 0则在区间(a,b)内,曲线y=f(x) 的图形是( ).
A、下降且为上凹的
B、下降且为下凹的
C、上升且为上凹的
D、上升且为下凹的
【正确答案】:B
【题目解析】:【答案解析】在(1,+∞)内f′(x)< 0,函数f(x)单调下降, f′′(x)< 0,函数f(x)上凸或者说下凹,选B。
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