已知集合M={(x, y)| x+ y ="3}," N ={(x,y)|x-
题型:选择题
问题:
已知集合M={(x, y)| x+ y ="3}," N ={(x,y)|x- y =5}则集合M∩N=( )
A.x =" 4," y =-1
B.{(4,-1)}
C.(4,-1)
D.{4 ,-1}
已知集合M={(x, y)| x+ y ="3}," N ={(x,y)|x- y =5}则集合M∩N=( )
A.x =" 4," y =-1
B.{(4,-1)}
C.(4,-1)
D.{4 ,-1}