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x+3y-5=0 x+3y-15=0 x-3y+5=0 x-3y+15=0
3x+4y-14=0 3x-4y+14=0 4x+3y-14=0 4x-3y+14=0
x+2y-5=0 x+2y+5=0 2x-y=0或x+2y-5=0 2x-y=0或x-2y+3=0
2﹣5 ﹣5 2+5 5
3x-2y = 0 x + y-5 = 0 2x-3y = 0 或x + y-5 = 0 3x-2y = 0 或x + y-5 = 0
)x+y<0 ( )x+y>0 ( )x-y<0 ( )x-y>0
3x+2y-1=0 3x+2y+7=0 2x-3y+5=0 2x-3y+8=0
2x+y+1=0 2x-y-5=0 2x-y-1=0 2x-y+5=0
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
3x+4y-14=0 3x-4y+14=0 4x+3y-14=0 4x-3y+14=0
={(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