B={(x,y)|5x+yy=6},是B={(x,y)|5x+y=6},吧,按这个算了.
2x-y=1,5x+y=6
则x=1,y=1
A∩B=={(x,y)|(1,1)}
5x+y=6,2x=y+1
则:x=1,y=1
B∩C={(x,y)|(1,1)}
2x-y=1,2x-y=8
则
A∩D=={空集}
B={(x,y)|5x+yy=6},是B={(x,y)|5x+y=6},吧,按这个算了.
2x-y=1,5x+y=6
则x=1,y=1
A∩B=={(x,y)|(1,1)}
5x+y=6,2x=y+1
则:x=1,y=1
B∩C={(x,y)|(1,1)}
2x-y=1,2x-y=8
则
A∩D=={空集}