要使sin(a-π/6)=(2m-3)/(4-m)有意义,m的取值范围是

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要使sin(a-π/6)=(2m-3)/(4-m)有意义,m的取值范围是

要使sin(a-π/6)=(2m-3)/(4-m)有意义,m的取值范围是
要使sin(a-π/6)=(2m-3)/(4-m)有意义,m的取值范围是

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