x+2≠0 x≠-2
x+4≠0 x≠-4
x+3≠0 x≠-3
x≠0
故：若分式x+1/x+2除以x+4/x+3乘以1/2x 有意义,则x的取值范围是x∈R且x≠-2 x≠-4 x≠-3 x≠0