学びの黄金比は○：○ https://moaibou.com/2020/08/22/%e5%ad%a6%e3%81%b3%e3%81%ae%e9%bb%84%e9%87%91%e6%af%94%e3%81%af%e2%97%8b%ef%bc%9a%e2%97%8b/