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Beijing normal university printing plate senior one mathematics compulsory one chapter two review questions group a first question and second question (function)
1: Mapping: 1, 3,4
Function: 1. , 2
2:a-0 b- 1
The mapping is one-to-one, or many-to-one, not many-to-one, but also empty-to-one. (That is, set B has no elements corresponding to set A.. But the elements in set A must all be mappings of set B.. )