**1.1

10

12

8

3

6

Value: a

Value: b

19

#f

4

16

6

16

**1.2

(/ (+ 5

        4

        (- 2 (- 3 (+ 6 (/ 4 5) ) ) ) )

    (* 3

       (- 6 2)

       (- 2 7) ) )

**1.3

(define (larger x y)

                  (> x y) x y)

(define (square x) (* x x) )

(define (sum_of_square x y)

　　　　　　(+ (square x) (square y) ) )

(define (sum_of_square_of_two_larger_number x y z)

　　　　　　(if (= x (larger x y) )

　　　　　　　　　(sum_of_square x (larger y z) )

　　　　　　　　　(sum_of_square y (larger x z) ) ) )

**1.4

The comboination use if clause to decide the operator should be - or +, with which the absolute value of b can be get.

**1.5

The interpreter using natural-order evaluation would fall into the endless loop and the other interpreter would give a result as 0.

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