若映射f:{1,2,3````}------{1,2,3````},满足f(1)
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若映射f:{1,2,3````}------{1,2,3````},满足f(1)
若映射f:{1,2,3````}------{1,2,3````},满足f(1)
若映射f:{1,2,3````}------{1,2,3````},满足f(1)
因为f(f(x))=3x
则f(f(1))=3
若f(1)=1,则f(f(1))=f(1)=1 矛盾
若f(1)=3,则f(f(1))=f(3)=3 那么f(1)=f(3) 也矛盾
若f(1)>3,就更矛盾了
所以f(1)只能是2