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{3,–1} 3,–1 (3,–1) {(3,–1)}
x=3,y=-1 (3,-1) {(3,-1)} {3,-1}
={(x,y)|x,y为实数,且x2+y2=1}, ={(x,y)|x,y为实数,且x+y=1},则A.∩B.的元素个数为( ). A.4B.3 2 1
如果2x=2y+1,那么x=y+1 如果2=5+3x,那么3x=5﹣2 如果x﹣3=y﹣3,那么x=y 如果﹣8x=4,那么x=﹣2
={(x,y)|x,y为实数,且x2+y2=1}, ={(x,y)|x,y为实数,且x+y=1},则A.∩B.的元素个数为( ). A.4B.3 2 1
{3,-1} (3,-1) {(3,-1)} {x=3,y=-1}
={(x,y)|x,y为实数,且x2+y2=1}, ={(x,y)|x, y为实数,且x+y=1},则A.∩B.的元素个数为 ( ) A.4B.3 2 1