{(x,y)x+y=-1}u{(x,y)x-2y=8},求这连个集合的并集,
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{(x,y)x+y=-1}u{(x,y)x-2y=8},求这连个集合的并集,
{(x,y)x+y=-1}u{(x,y)x-2y=8},
求这连个集合的并集,
{(x,y)x+y=-1}u{(x,y)x-2y=8},求这连个集合的并集,
元素是点
所以就是这两条直线上的点
所以={(x,y)|x+y=-1,x-2y=8}
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