设A={y|y=x^2+1},B={x|y=x^2+1},C={(x,y)|y=x^2+1}则A={y
|y>=1},B=R,则A包含于B,C=B*A.
{y|y=x^2+1},{x|y=x^2+1},{(x,y)|y=x^2+1}.三者有什么关系.
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