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【SICP练习】150 练习4.6

练习4-6 原文 Exercise 4.6. Let expressions are derived expressions, because (let (( ) … ( )) ) is equivalent to ((lambda ( … ) ) ) Implement a syntactic transformation let->co...

【SICP练习】152 练习4.8

练习4-8 原文 Exercise 4.8. “Named let” is a variant of let that has the form (let <var> <bindings> <body>) The and are just as in ordinary let, except that is bound within to ...

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