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📚 Dabble in the M.4 entrance exam (general cycle) Ep.2

👀 Who's waiting for the "picture that Bank wrote"?! 📄✨

All steps from understanding the problem → setting the equation → thinking about the solution 🎯

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🔥 Some things are easy... but many mistakes.

💡 Math is not a memorization, but a practical "way of thinking."

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Who is preparing to enter the 4th grade exam?

Save this post for review. 💙

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📺 The clip can be viewed on the channel.

YouTube: The tutorial butler

From March 18, 6pm onwards.

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And please click to follow too 🔔

When you sign a new clip, you will be notified immediately and for channel members to watch the clip before anyone else. 💛📐

# Bank, butler, math tutoring # Entrance exam 4

# Math # math # Math tutor

3/17 Edited to

... Read moreถ้าค้นหา “โจทย์พาราโบลา” เพื่อเตรียมสอบเข้า ม.4 ส่วนใหญ่จะเจอ 2 แนวหลัก ๆ คือ (1) หาองค์ประกอบของกราฟให้ครบ (2) โจทย์ประยุกต์ร่วมกับเรขาคณิต เช่น หาพื้นที่สามเหลี่ยมจากจุดตัดแกน วันนี้ขอแชร์ทริคที่ผมใช้ทำข้อสอบให้ไวขึ้นแบบเป็นขั้นตอน (ไม่ต้องท่องจำอย่างเดียว) 1) จำรูปแบบสมการให้คล่อง (ช่วยลดเวลามาก) - รูปทั่วไป: y = ax^2 + bx + c • จุดตัดแกน y คือ (0, c) • แกนสมมาตร x = -b/(2a) • ค่าต่ำสุด/สูงสุดคือค่า y ที่ x = -b/(2a) - รูปจุดยอด: y = a(x-h)^2 + k • จุดยอดคือ (h, k) อ่านออกทันที • ถ้า a>0 กราฟหงาย มีค่าน้อยสุด = k • ถ้า a<0 กราฟคว่ำ มีค่าสูงสุด = k 2) เทคนิคหา “จุดตัดแกน x” แบบกันพลาด เวลาโจทย์ให้หาจุดตัดแกน x ให้ตั้ง y = 0 แล้วแก้สมการกำลังสอง - ถ้าแยกตัวประกอบได้ให้แยกก่อน (เร็วกว่า) - ถ้าดูแล้วแยกยาก ค่อยใช้สูตรกำลังสอง หรือทำให้อยู่ในรูป (x-h)^2 = … ทริคเช็กคำตอบเร็ว ๆ: เอาค่า x ที่ได้กลับไปแทนในสมการคร่าว ๆ ว่าควรได้ y=0 จริงไหม ลดความผิดพลาดจากการย้ายข้าง/เปลี่ยนเครื่องหมาย 3) โจทย์ยอดฮิต: พาราโบลากับ “พื้นที่สามเหลี่ยม ABC” จากจุดตัดแกน แนวนี้มักให้กราฟตัดแกน x ที่ A, B และตัดแกน y ที่ C (หรือสลับกัน) แล้วถามพื้นที่สามเหลี่ยม วิธีทำที่ผมใช้ประจำ: - หา “พิกัด” ให้ครบก่อน: A(x1,0), B(x2,0), C(0,c) - ถ้า A และ B อยู่บนแกน x เส้น AB จะเป็นฐานแนวนอน • ความยาวฐาน AB = |x2 - x1| • ความสูงจากจุด C ถึงแกน x = |c| • พื้นที่ = 1/2 × |x2-x1| × |c| ข้อควรระวัง: ถ้า C ไม่ได้อยู่บนแกน y หรือฐานไม่ได้ขนานแกน ให้ใช้สูตรพื้นที่พิกัดแทน พื้นที่สามเหลี่ยมจากพิกัด: 1/2 |x1(y2-y3)+x2(y3-y1)+x3(y1-y2)| 4) เช็กลักษณะกราฟจากค่า a (ช่วยตีความโจทย์) - a>0 กราฟหงาย มักถาม “ค่าน้อยที่สุด” - a<0 กราฟคว่ำ มักถาม “ค่าสูงที่สุด” และถ้าโจทย์บอกว่า “ผ่านจุด” หรือ “สัมผัสแกน x” ให้คิดเรื่องจำนวนจุดตัดแกน x: - ตัด 2 จุด: มีคำตอบ 2 ค่า - สัมผัส (แตะ) 1 จุด: ดิสคริมิแนนต์ b^2-4ac = 0 หรืออยู่ในรูป y=a(x-h)^2 5) วิธีอ่านโจทย์ให้ไวแบบคนทำข้อสอบจริง ผมจะไฮไลต์ 3 อย่างก่อนเริ่มทำ: (1) สิ่งที่โจทย์ให้ (2) สิ่งที่ถาม (3) คำใบ้สำคัญ เช่น จุดตัดแกน/จุดยอด/พื้นที่ แล้วค่อยเลือก “รูปสมการ” ที่ทำให้ง่ายที่สุด เช่น ถ้าโจทย์บอกจุดยอดชัด ๆ ให้เขียนเป็น y=a(x-h)^2+k จะเร็วกว่าเริ่มจาก ax^2+bx+c ลองใช้เช็กลิสต์นี้กับโจทย์พาราโบลาที่มีทั้งหาจุดตัดแกน จุดยอด และโจทย์พื้นที่สามเหลี่ยม ABC จะช่วยให้ไล่ขั้นตอนเป็นระบบและลดการหลงทางได้เยอะมากครับ/ค่ะ

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