SICP 习题答案 1.1 - 1.5

; 练习 1.1101283619#f416616

; 练习 1.2(/ (+ 5 4 (- 2 (- 3 (+ 6 (/ 4 5)))))   (* 3 (- 6 2) (- 2 7)))

; 1.3 这个题，中文书让返回较大的两数之和，英文书是两数平方之和(define (sum-top-two x y z)  (if (> x y)      (+ x (if (> y z) y z))      (+ y (if (> x z) x z))))
; Exercise 1.3.  Define a procedure that takes three numbers as arguments and returns the sum of the squares of the two larger numbers.(define (sum x y z)  (define (bigger a b)    (if (> a b) a b))
  (define (square x) (* x x))    (define (sum-of-squares x y)     (+ (square x) (square y)))    (if (> x y)     (sum-of-squares x (bigger y z))     (sum-of-squares y (bigger x z))))