下列函数f(x)中满足对任意x1,x2属于(0,正无穷)当x1<x2时都有f(x1)>f(x2)的是?A:f(x)=1\xB:f(x)=(x-1)的平方C:f(x)=e的x次方D:f(x)=ln(x+1)
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![下列函数f(x)中满足对任意x1,x2属于(0,正无穷)当x1<x2时都有f(x1)>f(x2)的是?A:f(x)=1\xB:f(x)=(x-1)的平方C:f(x)=e的x次方D:f(x)=ln(x+1)](/uploads/image/z/12516990-6-0.jpg?t=%E4%B8%8B%E5%88%97%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%E4%B8%AD%E6%BB%A1%E8%B6%B3%E5%AF%B9%E4%BB%BB%E6%84%8Fx1%2Cx2%E5%B1%9E%E4%BA%8E%EF%BC%880%2C%E6%AD%A3%E6%97%A0%E7%A9%B7%EF%BC%89%E5%BD%93x1%EF%BC%9Cx2%E6%97%B6%E9%83%BD%E6%9C%89f%EF%BC%88x1%EF%BC%89%EF%BC%9Ef%EF%BC%88x2%EF%BC%89%E7%9A%84%E6%98%AF%3FA%EF%BC%9Af%EF%BC%88x%EF%BC%89%3D1%5CxB%EF%BC%9Af%EF%BC%88x%EF%BC%89%3D%EF%BC%88x-1%EF%BC%89%E7%9A%84%E5%B9%B3%E6%96%B9C%EF%BC%9Af%EF%BC%88x%EF%BC%89%3De%E7%9A%84x%E6%AC%A1%E6%96%B9D%EF%BC%9Af%EF%BC%88x%EF%BC%89%3Dln%EF%BC%88x%2B1%EF%BC%89)
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下列函数f(x)中满足对任意x1,x2属于(0,正无穷)当x1<x2时都有f(x1)>f(x2)的是?A:f(x)=1\xB:f(x)=(x-1)的平方C:f(x)=e的x次方D:f(x)=ln(x+1)
下列函数f(x)中满足对任意x1,x2属于(0,正无穷)当x1<x2时都有f(x1)>f(x2)
的是?
A:f(x)=1\x
B:f(x)=(x-1)的平方
C:f(x)=e的x次方
D:f(x)=ln(x+1)
下列函数f(x)中满足对任意x1,x2属于(0,正无穷)当x1<x2时都有f(x1)>f(x2)的是?A:f(x)=1\xB:f(x)=(x-1)的平方C:f(x)=e的x次方D:f(x)=ln(x+1)
要使得:函数f(x)中满足对任意x1,x2属于(0,正无穷)当x1<x2时都有f(x1)>f(x2)
即为:函数f(x)在x属于(0,正无穷)时:是减函数
所以:选A
属于减函数 A
题目中的条件说明这个函数在(0,+∞)上是递减的,则选【A】