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已知集合A到B的映射f:x→y=2x+1,那么集合A中元素2在B中的象是( ) ...
已知集合A到B的映射f:x→y=2x+1,那么集合A中元素2在B中的象是( )
A.2
B.5
C.6
D.8
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C.
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D.
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⊆A
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