1.已知集合A={(x,y)/y=ax+1},B={(x,y)/y=/x/},且A与B交集为单元素集,求a的取值范围.2.已知集合A={(x,y)/ax+y=1},B={(x,y)/x+ay=1},C={(x,y)/x^2+y^2=1}.(1)当a为何值时,（A并B）交C有两个元素(2)当a为何值时,（A并B）交C

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