Question

求离散数学高手帮忙```设集合A={a,b,{a,b}},B={{a},{b},a,b},求B∩A，A∪B和A-B，B⊙A

设集合A={a,b,{a,b}},B={{a},{b},a,b},求B∩A，A∪B和A-B，B⊙A
解 B∩A＝{{a}, {b}, a, b }∩{a, b, {a, b}}=______________
A∪B={a, b, {a, b}}∪{{a}, {b}, a, b }=______________
A－B={a, b, {a, b}}－{{a}, {b}, a, b }=______________
B⊙A={ a, b, {a}, {b}, {a, b}}－{ a, b}=______________

，
3和4呢- -```烦请回答完整，谢谢``在线急等```

第4题的那个符号是“对称差”打不出来那个符号而已- -``

Answer 1

(1) B∩A= 空
(2) A∪B={{a, b}, c, d . a, b, {c, d }}
(3) A－B={{a, b}, c, d }
(4) B⊙A={<a. {a, b}>.<a,c>,<a,d><b, {a, b}>,<b,c>,<b,d>,< {c, d },{a, b}>,<{c, d },c},<{c, d },d>}

Answer 2

1,
={a,b}
2,
={a,b,{a,b},{a},{b}}

Answer 3

1,
={a,b}
2,
={a,b,{a,b},{a},{b}}
3,
={{a,b}}

Answer 4

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