SICP 問題 3.62
二つのべき級数を割る手続きdiv-stream
(define (div-stream s1 s2) (if (= s2 0) (error "ZERO-DIVISOR" s2) (mul-streams s1 (invert-unit-series s2))))
二つのべき級数を割る手続きdiv-stream
(define (div-stream s1 s2) (if (= s2 0) (error "ZERO-DIVISOR" s2) (mul-streams s1 (invert-unit-series s2))))