更多“ 设有如图所示的关系R和S，求R1=R-S；R2＝R∪S；R3＝R∩S；R4＝R×S<br /> <img src="https://nimg.ppkao.com/2019-04/tangxixi/2019041913231729231.jpg?sign=dc56af4e151c5cbc6521886b8ed57212&t=62d73b8e" /><img src="https://nimg.ppkao.com/2019-04/tangxixi/2019041913231923756.jpg?sign=8dab4aca790d0ed3e4cddc00067912a0&t=62d73b8e" />”相关的问题
A、如图所示的关系R和S，计算：R1=R-S、R2=R∪S、R3=R∩S、R4=R×S。src="https://img.ppkao.com/2019-04/tangxixi/2019041908441976394.jpg" />
src="https://img.ppkao.com/2019-04/tangxixi/2019041908442583053.jpg" />
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