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+#lang racket
+
+;;; Exercise 01
+
+(define (10^len n)
+  (if (= n 0)
+    1
+    (* (10^len (quotient n 10)) 10)))
+
+(define (substr? a b)
+  (define (calc-iter b comp)
+    (cond [(= b 0) #f]
+          [(= (remainder (- b a) comp) 0) #t]
+          [else (calc-iter (quotient b 10) comp)]))
+  (calc-iter b (10^len a)))
+
+(substr? 123 5123783)
+
+;;; Exercise 02
+
+(define (my-identity x)
+  x)
+
+(define (my-compose f g)
+  (lambda (x) (f (g x))))
+
+(define (my-negate p?)
+  (not p?))
+
+(define (my-curry f x)
+  ((curry f) x))
+
+;;; Exercise 03
+
+(define (difference F a b)
+  (- (F a) (F b)))
+
+;;; Exercise 04
+
+(define f
+  (lambda (x) (* 2 x)))
+
+;;; Exercise 05
+
+(define (derive f eps)
+  (lambda (x) (/ (- (f (+ x eps)) (f x)) eps)))