Question

若代数式[(a+1)/(a-1)]/[(a-3)/(a+3)]有意义,则的取值范围是怎样的?

Answer 1

[(a+1)/(a-1)]/[(a-3)/(a+3)]=【(a+1)*(a+3)】/[(a-3)*(a-1)]

只需[(a-3)*(a-1)]不等于0

所以a不等于1和3