據說這道題90%都不會的數學題(how-to-solve-for-the-area-viral-math-problem)

資料料源: https://mp.weixin.qq.com/s?__biz=MjM5NDAwOTUzNA==&mid=2247495057&idx=2&sn=aefcf1ba112ceb241ca810727f03a8e8&chksm=a68cf54091fb7c56fd448ea88b24f3b60f0d2bbb568815b8b898abdb74311d7d23dcc26d19a1&scene=126&sessionid=1591143844&key=b14b8c141f06af5f05cd29db28c6e85736521f787ec6cedb759b4cacf8dc62fbfd42d016e3898b614bd7c90cfa8f3baf35d4c17106afa92e0ab75621f5ae8554ba4aa52989b10035b90edf984535a1aa&ascene=1&uin=MjIwODk2NDgxNw%3D%3D&devicetype=Windows+10+x64&version=62090070&lang=zh_TW&exportkey=AtiYBpZoT8SvqdWM7YFUZhI%3D&pass_ticket=34FNphL53ca%2BFkU5%2BMGv7CZJOCh4IUr42MExWFXBryXAHjiwV7Zfo%2B73Ou8%2FBKUC

https://mindyourdecisions.com/blog/2018/07/26/solve-for-the-shaded-area-you-should-be-able-to-solve-this/

https://www.youtube.com/watch?v=BgrWHOocYZA&feature=emb_logo

題目:

解答:

心得:
我也不會，但是我會用工具(使用圖片搜尋功能)找到答案
原來這是變相的賣書 行銷/廣告 噱頭 [ 透過影片流量 介紹實體書籍 藉此達到流量變現 (一魚雙吃)]