1,已知集合A={(x,y)|x^2-2x+y^2=0},集合B={(x,y)|y=三分之一(x^2-4),集合C={(x,y)|y=kx+b},若(A∩B)∪C,求k,b的值2,满足关系式{1}包含于B包含于{1,2,3,4}的集合B有___个3,如果集合P={y|y=x^2,x属于R},集合Q={y|y=-2x^2+3,x
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