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Forge the object into a new piece, the same volume as # entrance exam # exam

Melting objects to make them into new pieces.

📍 the volume must be the same. 📍

Cylindrical volume = number of balls * spherical volume

✏️ divide the pie by the speed of solving the equation.

# ep # Entrance exam

2/24 Edited to

... Read moreการคำนวณปริมาตรเมื่อหลอมวัตถุและสร้างชิ้นใหม่เป็นเรื่องสำคัญมากในข้อสอบเข้า ม.4 ที่มักจะให้โจทย์เกี่ยวกับการเปลี่ยนรูปของวัสดุโดยปริมาตรต้องคงที่ ซึ่งหมายความว่าวัตถุที่หลอมแล้วจะต้องมีปริมาตรเท่ากับปริมาตรวัตถุดั้งเดิมทั้งหมด จากโจทย์ที่ยกตัวอย่างไว้ เช่น ทรงกระบอกตะกั่วที่มีเส้นผ่านศูนย์กลาง 12 เซนติเมตรและความสูง 5 เซนติเมตร เมื่อหลอมใหม่เป็นลูกกลมหลายลูก จะต้องคำนวณปริมาตรของทรงกระบอกก่อน โดยใช้สูตร ปริมาตร = พื้นที่ฐาน × สูง โดยพื้นฐานของทรงกระบอกคือวงกลม ซึ่งมีสูตรพื้นที่ = π × r² จากนั้นนำปริมาตรที่ได้มาเท่ากับผลรวมปริมาตรลูกกลมลูกใหม่ ซึ่งมีสูตรปริมาตร = (4/3)πr³ เทคนิคที่แนะนำในบทความคือการใช้ค่า π ร่วมกับการหารทั้งสมการ เพื่อทำให้การแก้โจทย์มีความรวดเร็วและง่ายขึ้น เช่น การตัดค่า π ออกจากทั้งสองข้างของสมการ รวมไปถึงการจัดรูปแบบสมการให้ง่ายต่อการหาคำตอบทั้งความสัมพันธ์ระหว่างปริมาตรและจำนวนลูกบอลที่ได้ ประสบการณ์ส่วนตัวจากการสอนและเตรียมตัวสอบพบว่า ถ้าเข้าใจหลักการหลอมและเปลี่ยนรูปร่างของวัตถุภายใต้เงื่อนไขปริมาตรคงที่ จะช่วยให้ทำโจทย์เกี่ยวกับปริมาตรได้รวดเร็วและแม่นยำขึ้น อีกทั้งยังลดความสับสนและความผิดพลาดในการคำนวณ นอกจากนี้ การฝึกใช้สูตรและวิธีการลดขั้นตอนการคำนวณ เช่น ตัดค่า π ออก หรือจัดสมการใหม่ จะช่วยเพิ่มความมั่นใจและคะแนนในการสอบ

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