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[主观题]
1/4,3/6,4/7,2/5,5/8, ()A.7/9B.8/9C.-1/2D.10/9
1/4,3/6,4/7,2/5,5/8, ()
A.7/9
B.8/9
C.-1/2
D.10/9
提问人:网友geyinglong
发布时间:2022-01-06
1/4,3/6,4/7,2/5,5/8, ()
A.7/9
B.8/9
C.-1/2
D.10/9
1/4,3/6,4/7,2/5,5/8, ()
A.7/9
B.8/9
C.-1/2
D.10/9
A.1
B.2
C.3
D.4
确定下列各式是不是A={1,2,3,4,5}上的等价关系,如果是等价关系,请写出它的等价类。 (1) {(1,1),(2,2),(3,3),(4,4),(5,5),(1,3),(3,1),(1,5), (5,1), (3,5),(5,3)} (2) {(1,1),(2,2),(3,3),(4,4),(5,5),(1,3),(3,1),(3,4),(4,3)} (3) {(1,1),(2,2),(3,3),(4,4)} (4) {(a,b)|4整除a-b} (5) {(a,b)|a整除2-b}
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