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设函数f的定义域都是I.则g恒成立的充分必要条件是( )A.有一个x∈I.使gB.有无穷大
设函数f的定义域都是I.则g恒成立的充分必要条件是( )A.有一个x∈I.使gB.有无穷大
发布时间:2021-02-20 13:20:23
设函数f(x),g(x)的定义域都是I,则g(x)>f(x)恒成立的充分必要条件是( )
A.有一个x∈I,使g(x)>f(x)
B.有无穷大个x∈I,使g(x)>f(x)
C.在I上,g(x)的最小值大f(x)的最大值
D.在I上,g(x)-f(x)的最小值大于零
网友回答
答案:
分析:
对于A,有一个x∈I,使g(x)>f(x),则g(x)>f(x)不恒成立;
对于B,有无穷多个x∈I,使g(x)>f(x),也不能保证g(x)>f(x)恒成立;
对于C,在I上,g(x)的最小值大于f(x)的最大值,则g(x)>f(x)恒成立,反之不成立;
对于D,g(x)>f(x)恒成立等价于在I上,g(x)-f(x)的最小值大于零.
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