1.设A={,,},则 =________,=________,=________.

问题描述:

1.设A={,,},则 =________,=________,=________.
2.设A={1,2,3},R={,},则R的自反闭包r(R)= ____________,对称闭包s(R)= ____________.

第一个题目不全啊
第二题:自反闭包为={,,,},
对称闭包为={,,},1.设A={,,},则 domA=________, ranA =________,fldA=________.domA为{a,b,c}ranA为{1,2,3}fldA为{a,b,c,1,2,3}