問題1.1

Welcome to MzScheme v4.2.3 [3m], Copyright (c) 2004-2009 PLT Scheme Inc.
> 9
9
> (+ 5 3 4)
12
> (- 9 1)
8
> (/ 6 2)
3
> (+ (* 2 4) (- 4 6))
6
> (define a 3)
> (define b (+ a 1))
> (+ 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
>