sicp 习题2.17

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Welcome to DrRacket, version 5.3.3 [3m].Language: planet neil/sicp; memory limit: 128 MB.> (define a (list 1 2 3 4 5))> (last-pair a)(mcons 5 '())> 


运行:

Welcome to DrRacket, version 5.3.3 [3m].
Language: planet neil/sicp; memory limit: 128 MB.
> (define a (list 1 2 3 4 5))
> (last-pair a)
(mcons 5 '())