g(x)=4lnx-x^2+m-ln4
求导得g'(x)=4/x-2x=(4-2x^2)/x
令g'(x)=0 => x=√2
可知当x∈[1/e,√2)时 g'(x)>0 g(x)单调增
当x∈[√2,2] 时g'(x)<=0 g(x)单调减
若使题意成立 则
.当x=√2时 g(√2)=4ln√2-(√...
g(x)=4lnx-x^2+m-ln4
求导得g'(x)=4/x-2x=(4-2x^2)/x
令g'(x)=0 => x=√2
可知当x∈[1/e,√2)时 g'(x)>0 g(x)单调增
当x∈[√2,2] 时g'(x)<=0 g(x)单调减
若使题意成立 则
.当x=√2时 g(√2)=4ln√2-(√...