{"image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20071030%2Fp2\" title=\"\u554f\u984c2-1 - \u7406\u7cfb\u5b66\u751f\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://kiririmode.hatenablog.jp/","blog_title":"\u7406\u7cfb\u5b66\u751f\u65e5\u8a18","categories":["SICP"],"provider_url":"https://hatena.blog","title":"\u554f\u984c2-1","author_name":"kiririmode","description":"2\u7ae0\u306f\u30c7\u30fc\u30bf\u306e\u62bd\u8c61\u304c\u30c6\u30fc\u30de\uff0e \u307e\u305a\u306f\u6709\u7406\u6570\u3092\u30c7\u30fc\u30bf\u3068\u3057\u3066\u8868\u3057\u3066\u3001\u7b26\u53f7\u3092\u6b63\u898f\u5316\u3067\u304d\u308b\u6709\u7406\u6570\u69cb\u7bc9\u95a2\u6570make-rat\u3092\u5b9a\u7fa9\u3059\u308b\u3002 (define (add-rat x y) (make-rat (+ (* (numer x) (denom y)) (* (numer y) (denom x))) (* (denom x) (denom y)))) (define (sub-rat x y) (make-rat (- (* (numer x) (denom y)) (* (numer y) (denom x))) (* (denom x) (denom y)))) (define (mul-rat \u2026","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/kiririmode/","version":"1.0","published":"2007-10-30 00:00:01","width":"100%","url":"https://kiririmode.hatenablog.jp/entry/20071030/p2","type":"rich","height":"190"}