方程ax+b=0的解集为A①A为空集,则a,b满足条件?②A为有限,则a,b满足?③A为无限集,则a,b满足?
问题描述:
方程ax+b=0的解集为A①A为空集,则a,b满足条件?②A为有限,则a,b满足?③A为无限集,则a,b满足?
答
x=-b/a ①A为空集,则a,b满足a=0,b ≠0 ②A为有限,则a,b满足a= ≠ 0,b ≠0 ③A为无限集,则a,b满足a=0,b= 0