#| BEGIN (Введите свое решение) |#
(define (average x y)
  (/ (+ x y) 2))

(define (improve guess x)
  (average guess (/ x guess)))

(define (better-good-enough? guess perv-guess)
  (< (abs (- guess perv-guess)) 0.001))

(define (better-sqrt-iter guess x perv-guess)
  (if (better-good-enough? guess perv-guess)
      guess
      (better-sqrt-iter (improve guess x) x guess)))

(define (square-root x)
  (better-sqrt-iter 1.0 x x))
#| END |#