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={1,2,3,4}, ={y|y=3x﹣2,x∈A.},则A.∩B.=( ) A.{1}B.{4} {1,3} {1,4}
y=2x+3 y=2x﹣3 y﹣3=2x+3 y=3x﹣3
{3,–1} 3,–1 (3,–1) {(3,–1)}
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x=3,y=-1 (3,-1) {(3,-1)} {3,-1}
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3a-2b=ab 5y-3y=2 7a+a=7a2 3x2y-2yx2=x2y
Æ {x|x³1} {x|x>1} {x| x³1或x<0}
={(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
={(x,y)|x,y是实数,且x2+y2=1}, ={(x,y)|x,y是实数,且y=x},则A.∩B.的元素个数为( ). A.0B.1 2 3