(define (sqrt-iter guess x)
(if (good-enough? guess x)
guess
(sqrt-iter (improve guess x)
x)))
(define (improve guess x)
(average guess (/ x guess)))
(define (average x y)
(/ (+ x y) 2))
(define (good-enough? guess x)
(< (abs (- (square guess) x)) 0.001))
(define (abs x)
(if (> x 0)
x
(- x)))
(define (square x)
(* x x))
(define (sqrt x)
(sqrt-iter 1.0 x))
采用牛顿法求平方根
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转载自blog.csdn.net/BobDay/article/details/103623100
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