设A={(x,y)|3x+2y=1},B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D=((x,y)|6x+4y=2),求A∩B,B∩C,A∩D.
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设A={(x,y)|3x+2y=1},B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D=((x,y)|6x+4y=2),求A∩B,B∩C,A∩D.
设A={(x,y)|3x+2y=1},B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D=((x,y)|6x+4y=2),
求A∩B,B∩C,A∩D.
设A={(x,y)|3x+2y=1},B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D=((x,y)|6x+4y=2),求A∩B,B∩C,A∩D.
就是解二元一次方程组.
A∩B为 3x+2y=1
x-y=2
解得x=1,y=-1
于是A∩B为{(1,-1)}
同理,B∩C为空集
A∩D为所有点集,为全集.
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