Click here for a video of the question given to the Brain King, and the scene explaining this problem is from around 17:00. https://youtu.be/lWaSEWWMxjg The first half of the video explains this issue. Explains how to use 30 ° and 150 °. The second half explains the questions that were asked at the Junior Arithmetic Olympics 2018 Final. Both are mental arithmetic methods that can be solved in “seconds”. Sanyobi (Preparatory School for Examination Arithmetic) Mr. Sanyobi teaches mathematics at a junior high and high school integrated school during the day and at a cram school at night. He has been teaching math school instructors in the junior high school exam world for nearly 20 years, and is also in charge of the most difficult schools. We aim to make every student a “winner of February”. Arithmetic and mathematics are interesting! We are developing active and fun lessons with the motto. In the spring of 2021, YouTube distribution started. We will do our utmost to support the absolute passing of elementary school students, junior high school students, and high school students who are taking the exam. The video here has many useful problems not only for junior high school entrance exams, but also for adults who want to relearn math from scratch, SPI measures, proper inspection measures, etc., so we will focus on fun and interesting problems. I am seriously writing the entrance exam commentary. ☆ Channel registration https://www.youtube.com/channel/UCfq-ErtTVXHyXWi9uTYHG2A?sub_confirmation=1 ☆ note Admission problem explanation note https://note.com/sanyobi ☆ twitter (Job request to Twitter DM) https://twitter.com/San_Yobi ..
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