A – B={{a,b},1,2}-{ a,b,{1},1}=?怎么算?

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A–B={{a,b},1,2}-{a,b,{1},1}=?怎么算?A–B={{a,b},1,2}-{a,b,{1},1}=?怎么算?A–B={{a,b},1,2}-{a,b,{1},1}=?怎么算?=

A – B={{a,b},1,2}-{ a,b,{1},1}=?怎么算?
A – B={{a,b},1,2}-{ a,b,{1},1}=?
怎么算?

A – B={{a,b},1,2}-{ a,b,{1},1}=?怎么算?
={{a,b},2}