摘要： (define (expmod base exp m ) (cond ((=exp 0 ) 1) ((even? exp) (remainder (square (expmod base (/ exp 2) m)) m)) (else (remainder (* base (expmod base (- exp 1) m)) m)) ))(define (fermat-test n) (define (try-it a) (= (expmod a n n) a)) (try-it (+1 (random (- n 1)))))(define (fast-prime? n times) (c.. 阅读全文