设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的取值范围

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设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的取值范围

设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的取值范围
设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的取值范围

设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的取值范围
根据B,可知 -2