摘要： 为什么 （R1*R2)/(R1 + R2) 与 1/(1/R1+1/R2)求得的值不同。(define (par1 r1 r2) (div-interval (mul-interval r1 r2) (add-interval r1 r2)))(define (par1 r1 r2) (let ((one (make-interval 1 1))) (div-interval one (add-interval (div-interval one r1) ... 阅读全文