已知全集U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则(u(M∪N)=

问题描述:

已知全集U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则(u(M∪N)=