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# Math think fast, ep34 think root stacking root, take off a simple square root

2025/8/7 Edited to

... Read moreในการถอดรูทซ้อนรูท หลายคนอาจรู้สึกว่ายาก เพราะต้องเข้าใจวิธีแยกรากที่สองของตัวเลขที่ซับซ้อน แต่จริงๆ แล้วมีเทคนิคง่ายๆ ที่ช่วยให้การถอดรูทซ้อนรูทชัดเจนขึ้นอย่างมาก เคล็ดลับที่ผมใช้คือการมองก้อนข้อมูลภายในรูท เช่น รูปแบบ 5 + 2√6 ซึ่งสามารถแยกออกมาเป็น 2 ส่วนประกอบกันโดยสังเกตจากค่าภายในรูท วิธีนี้ทำให้เรารู้ว่าควรหาค่าที่สองตัวอ่านแล้วยกกำลังสองแล้วเท่ากับค่าที่อยู่ในรูทซ้อนกัน อีกเรื่องที่ช่วยได้คือการฝึกทำตารางถอดรูท เพื่อให้เห็นความสัมพันธ์ระหว่างจำนวนในรูปแบบต่างๆ ทำให้ตอนเจอโจทย์จริงๆ เราจะจำรูปแบบและสูตรได้เร็วขึ้น จากประสบการณ์การสอน ผมพบว่าการเข้าใจพื้นฐานแนวคิดนี้ ทำให้การแก้ปัญหาคณิตศาสตร์ที่ดูซับซ้อนกลายเป็นเรื่องง่าย และช่วยเพิ่มความมั่นใจในการทำข้อสอบมากขึ้น ถ้าอยากเก่งขึ้น แนะนำให้ลองจดแบบฝึกหัดและทำซ้ำๆ เพื่อฝึกสมองให้คุ้นเคยกับวิธีคิดแบบนี้ ซึ่งจะเป็นประโยชน์มากในระยะยาว

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