使代数式x+2/x-3除以x+1/x-2有意义的x满足看到,会写的帮个忙行吗
问题描述:
使代数式x+2/x-3除以x+1/x-2有意义的x满足
看到,会写的帮个忙行吗
答
(x+2)/(x-3)除以(x+1)/(x-2)
=(x+2)/(x-3)*[(x-2)/(x+1)]
=(x+2)(x-2)/[(x-3)(x+1)]
使得代数式有意义的x满足:
x-3≠0且x-2≠0且x+1≠0
即:x≠3且x≠2且x≠-1