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[主观题]
集合A={x,y,z},B={1,2,3),试说明下列A到B的二元关系中,哪些能构成函数? (1){(x,1),(x,2),(y,1),(z,3)} (2
集合A={x,y,z},B={1,2,3),试说明下列A到B的二元关系中,哪些能构成函数?
(1){(x,1),(x,2),(y,1),(z,3)}
(2){(x,1),(y,1),(z,1)}
(3){(x,2),(y,3)}
(4){(x,3),(y,2),(z,3),(y,3)}
(5){(x,2),(y,1),(y,2)}
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