已知三个集合a=｛x↓x2－3x＋2=0｝,b=｛x↓x2－ax＋（a－1）=0,c=｛x↓x2－3

已知三个集合a=｛x↓x2－3x＋2=0｝,b=｛x↓x2－ax＋（a－1）=0,c=｛x↓x2－3

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.======以下答案可供参考======供参考答案1:c集合呢，没有要求吗？题目完整了，一定帮你解除！供参考答案2:a={1,2}所以集合a 和值a有关系吗？供参考答案3:What is the most popular sport ?Sure,it's basketall.Is there a most famous basketball programmes?It's NBA.Who's the most famous NBA star?The answer then is Michael Jordan. By acclamation, Jordan is the foremost basketball player of them all.Jordan was just about the most successfully marketed athletes of his generation and was instrumental in popularizing the NBA all over the world inside the eighties and 1990s.Eveywhere whether or not in streets or in stores,you can see people sporting Jordans footwear.You believe that is cool and imagine having certainly one of your self 1 day.That is understandable,people have the same dream as you.In reality,Air Jordan 9 Kids Shoes,every cool basketball guy(atheltes and followers)should have a minimum of a set of sneakers, and Nike air jordan shoes are your best option to allow them to exhibit them type and taste for sportsmanship.You could have purchased a lot of pairs of shoes,they're remarkably cheap which perhaps run you ten or twenty dollars,Cheap Air Jordan Shoes 13,however they is only able to wear for few months.They're so easily worn out that you have to buy new shoes each and every 2 months.You're sick and tired of changing shoes continuously,it is definitely troublesome.You want to purchase a set of footwear that is inexpensive and durable,Nike Air Jordan Shoes 2011,trendy,favourably.If I suggest Air Jordan footwear,Discount Air Jordan Shoes,I assume the first reaction is Nike air jordan footwear is too expansive to pay for.That's fifty percent true.In most cases,Jordans shoes are much more expansive than its countparts,all things considered,Jordans shoes are wprld-famous brand with good popularity around the globe.But there is no need to be diaappointed,you still have a way to get one,because don't assume all Air Jordan footwear is away from reach.The revolution of Internet declares the appearance of shopping online,therefore you can get a set of Nike air jordan footwear much simpler than purchasing them physically at shops.However, you still must be cautious.Bear the following advice at heart.First and foremost,choosing your personal type.Although Air Jordan Shoes are supplied with a wide range of colors,styles amd types,but not

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