设全集U={1,2,3,4,5,6,7,8,9}……设全集U={1,2,3,4,5,6,7,8,9},若CuA∩CuB={4,5},CuA∩B={3,7},A∩CuB={6,8},则A= B= 能不能告诉一下方法.我做了两三道,每次都有漏的..
问题描述:
设全集U={1,2,3,4,5,6,7,8,9}……
设全集U={1,2,3,4,5,6,7,8,9},若CuA∩CuB={4,5},CuA∩B={3,7},A∩CuB={6,8},则A= B=
能不能告诉一下方法.我做了两三道,每次都有漏的..
答
设全集U={1,2,3,4,5,6,7,8,9},
若CuA∩CuB={4,5},
则4,5既不在A中,也不在B中
CuA∩B={3,7},
同理3,7不在A中,但在B中,
A∩CuB={6,8},
6,8在A中,但不在B中
则A= {1,2,6,8,9}
B= {1,2,3,7,9}