some solutions for MIT Press's "structure and interpretation of computer programs", I guess
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10
;; => 10
(+ 5 3 4)
;; => 12
(- 9 1)
;; => 8
(/ 6 2)
;; => 3
(+ (* 2 4) (- 4 6))
;; => 6
(define a 3)
;; => n/a; a = 3
(define b (+ a 1))
;; => n/a; b = 4
(+ a b (* a b))
;; => 19
(= a b)
;; => #f
(if (and (> b a) (< b (* a b)))
b
a)
;; => 4
(cond ((= a 4) 6)
((= b 4) (+ 6 7 a))
(else 25))
;; => 16
(+ 2 (if (> b a) b a))
;; => 6
(* (cond ((> a b) a)
((< a b) b)
(else -1))
(+ a 1))
;; => 16