m的三次方<0,n的五次方>0,化简:n+2m-2│m│+│n│=?
问题描述:
m的三次方<0,n的五次方>0,化简:n+2m-2│m│+│n│=?
答
m的三次方<0 => m |m|=-m
n的五次方>0 => n>0 => |n|=n
n+2m-2│m│+│n│
=n+2m+2m+n
=4m+2n