要使sin(a-π/6)=(2m-3)/(4-m)有意义,m的取值范围是

问题描述:

要使sin(a-π/6)=(2m-3)/(4-m)有意义,m的取值范围是

-1≤(2m-3)/(4-m)≤1
4-m≠0
解不等式组