来自秦敬辉的问题
.5.定义A-B={x|x∈A且xB},5.定义A-B={x|x∈A且xB},若M={1,2,3,4,5},N={2,3,6},则M-(M-N)=()A.M∩NB.N∪NC.{1,4,5}D.{6}为什莫?
.5.定义A-B={x|x∈A且xB},
5.定义A-B={x|x∈A且xB},若M={1,2,3,4,5},N={2,3,6},则M-(M-N)=()A.M∩NB.N∪NC.{1,4,5}D.{6}为什莫?
1回答
2020-04-1119:42