已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围...已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围是＿.

已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围...已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围是＿.
已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围...
已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围是＿.

已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围...已知函数f(x)=1+1/(x+2m)在区间(－无穷大,1]上单调递减,则实数m的取值范围是＿.
求导f'(x)=-1/(x+2m)^2恒小于0,就是说f(x)在其定义域上是减函数.
要使其有意义,所以m不等于-x/2,又因为x在(－无穷大,1]上,即m