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♪ Math thinking fast, ep33, about the square root, not perfect. Fine.

2025/8/6 Edited to

... Read moreการประมาณรากที่สองเมื่อตัวเลขไม่ลงตัวนั้นถือเป็นเรื่องที่หลายคนอาจจะพบเจอในการเรียนคณิตศาสตร์และการแก้โจทย์เลขเร็ว ในประสบการณ์ของผมเอง เทคนิคที่พี่เหลิมจากคณิตคิดไวแนะนำนั้นคือการตั้งหารโดยใช้ตัวเลขที่ใกล้เคียงเพื่อให้การประมาณค่าสะดวกขึ้นและแม่นยำมากขึ้น วิธีนี้จะช่วยให้เราเห็นภาพชัดเจนขึ้นว่าค่ารากที่สองของตัวเลขนั้นอยู่ในช่วงใด เป็นการฝึกการประมาณค่าและการคิดอย่างรวดเร็วโดยไม่ต้องใช้เครื่องคิดเลข ซึ่งเหมาะกับการสอบและการใช้ในชีวิตประจำวันมาก ตัวอย่างเช่น การประมาณ √200 ที่ไม่ลงตัวจริงๆ เราจะตั้งหารด้วยตัวเลขที่คาดว่าน่าจะใกล้เคียง เช่น 14 เพราะ 14² = 196 ก็ค่อนข้างใกล้ 200 แล้วค่อยปรับค่าประมาณโดยใช้วิธีหารต่อ เสมือนเป็นการปรับค่าไปเรื่อยๆ จนกว่าจะได้ค่าที่พอใจ ในบทความนี้ยังได้รวบรวมเคล็ดลับและวิธีคิดเร็วจากประสบการณ์จริง อีกทั้งยังช่วยเสริมสร้างความเข้าใจในแนวคิดในการถอดรากที่สองแบบไม่ลงตัว เพื่อให้ผู้อ่านนำไปประยุกต์ใช้ได้ทันทีในบทเรียนและชีวิตจริง

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