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按照集合相等的證明方法,只要證明兩個集合互相包含即可. 設x∈Cu(A∩B),則x不屬於A∩B,那麼x不屬於A或者x不屬於B,所以x∈CuA或者CuB,即x∈(CuA)∪(CuB),所以Cu(A∩B)包含於CuA∪CuB. 同理可以證明CuA∪CuB包含於Cu(A∩B)(自己寫吧)
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