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次の関係R,S,T,Uにおいて,関係代数表現「R✕S÷T-U」の演算結果はどれか. ここで,✕は直積,÷は商,-は差の演算を表す.

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次の関係R,S,T,Uにおいて,関係代数表現「R✕S÷T-U」の演算結果はどれか.

ここで,✕は直積,÷は商,-は差の演算を表す.

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