已知三个集合a=｛x↓x2－3x＋2=0｝,b=｛x↓x2－ax＋（a－1）=0,c=｛x↓x2－3x＋b=0},问问同时满足b是a的真子集的实数a和b是否存在?若存在,求出a,b的值的集合,若不存在,说明理由

已知三个集合a=｛x↓x2－3x＋2=0｝,b=｛x↓x2－ax＋（a－1）=0,c=｛x↓x2－3x＋b=0},问问同时满足b是a的真子集的实数a和b是否存在?若存在,求出a,b的值的集合,若不存在,说明理由
已知三个集合a=｛x↓x2－3x＋2=0｝,b=｛x↓x2－ax＋（a－1）=0,c=｛x↓x2－3x＋b=0},问
问同时满足b是a的真子集的实数a和b是否存在?若存在,求出a,b的值的集合,若不存在,说明理由

已知三个集合a=｛x↓x2－3x＋2=0｝,b=｛x↓x2－ax＋（a－1）=0,c=｛x↓x2－3x＋b=0},问问同时满足b是a的真子集的实数a和b是否存在?若存在,求出a,b的值的集合,若不存在,说明理由
是同时满足b、c是a的真子集还是b是a、c的真子集?
不管存不存在,首先可以把集合a求出来,a={1,2}.
当a=1时,b={x|x^2-x=0}={0,1},此时b不是a的真子集.
当a=2时,b={x|x^2-2x+1=0}={1},此时b是a的真子集,c={x|x^2-3x+1=0}={（3-sqr5）/2,(3+sqr5)/2},此时c不是a的真子集（或b不是c的真子集）.
综上所述,不存在满足条件的a和b.

c集合呢，没有要求吗？
题目完整了，一定帮你解除！

a={1,2}
所以集合a 和值a有关系吗？

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