SICP勉強会してるので、 気が向いたら知見書いていけたらなぁと exe2.63 (define (tree->list-1 tree) (if (null? tree) '() (append (tree->list-1 (left-branch tree)) (cons (entry tree) (tree->list-1 (right-branch tree)))))) (define (tree->list-2 …