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M.4 - 6 Which math should be repeated? 📚

Prepare well before the start of this semester.

I concluded. Complete the whole school. 4-5-6

High school students, save this post.

.

📌 M.4: Set chapter

📌 M.5: Trigonometric chapter

📌 M.6: Sequence and Serial Chapters

.

Very important! Math is not a subject to memorize.

Only you can understand. I suggest

You do exercises together.

Will understand and be more accurate with the content

.

Who wants to summarize the content + techniques?

Before taking the exam at school, I have it for you.

"Click to follow" this channel.

.

# Math # Prepare the exam # SmartMathPro

4/21 Edited to

... Read moreถ้าน้อง ๆ กำลังหาคำตอบว่า “คณิต ม.6 เรียนอะไรบ้าง” จากประสบการณ์ที่ติว/ทวนกับน้อง ๆ มาหลายรุ่น สิ่งที่เจอบ่อยคือ ม.6 จะเน้นบทที่ “ต่อยอดจากพื้นฐาน” และออกโจทย์ประยุกต์มากขึ้น ไม่ใช่แค่จำสูตรแล้วแทนค่าได้เลย ดังนั้นก่อนเปิดเทอม (หรือก่อนสอบ) แนะนำให้ทวนเป็นลำดับแบบนี้จะเห็นภาพชัดที่สุด 1) ม.6: ลำดับและอนุกรม (หัวใจของ ม.6) บทนี้มักเจอทั้ง “ลำดับเลขคณิต-เรขาคณิต” และ “อนุกรม” โดยโจทย์จะชอบถามหาพจน์ที่ n, ผลบวก n พจน์แรก, และการประยุกต์กับสถานการณ์จริง เช่น การเติบโตแบบทวีคูณ (ลำดับเรขาคณิต) จุดที่ควรทวนให้แม่นคือการแยกให้ออกว่าโจทย์เป็นลำดับหรืออนุกรม และเป็นเลขคณิตหรือเรขาคณิต ทริคที่ใช้บ่อย: - อ่านโจทย์แล้วหา “a1” (พจน์แรก) กับ “d หรือ r” (ผลต่างร่วม/อัตราส่วนร่วม) ให้เจอก่อน - ถ้าเป็นอนุกรม ให้คิดเรื่อง “ผลบวก” ตั้งแต่ต้น ไม่หลงไปหาพจน์ที่ n อย่างเดียว 2) ม.5: ฟังก์ชันตรีโกณมิติ (ต่อยอดไปสอบบ่อย) หลายคนพลาดตรงกราฟและการอ่านค่า แนะนำให้ทวนเรื่องโดเมนและเรนจ์ให้ชัวร์ รวมถึงกราฟของ sin, cos, tan และการแปลงกราฟ (เลื่อนขึ้นลง/ยืดหด/เลื่อนซ้ายขวา) เวลาเจอโจทย์กราฟจะไม่ตื่น เช็กลิสต์ก่อนสอบ: - จำค่ามุมพิเศษให้ได้ และฝึกใช้วงกลมหนึ่งหน่วย/กราฟช่วยคิด - ฝึกอ่านโดเมน-เรนจ์จากกราฟจริง ๆ ไม่ใช่ท่องอย่างเดียว 3) ม.4: เซต + พื้นฐานจำนวนจริง (ฐานสำคัญมาก) แม้คำถามจะโฟกัส ม.6 แต่พื้นฐาน ม.4 อย่าง “เซต” มักโผล่มาในรูปแบบการให้เหตุผล/เงื่อนไข และเชื่อมกับความคิดเชิงตรรกะได้ดี อีกจุดที่ควรทวนคือเรื่องจำนวนตรรกยะ จำนวนอตรรกยะ และจำนวนจริง เพราะบางข้อชอบถามให้จัดประเภทหรือพิสูจน์แบบสั้น ๆ วิธีทวนให้ไม่หลง: - ทำสรุปสัญลักษณ์เซต (∪, ∩, ’) แล้วฝึกโจทย์แผนภาพเวนน์สัก 10-15 ข้อ จะเห็นแพตเทิร์นทันที สุดท้าย ถ้าอยากทวนให้ “แม่นจริง” ให้จัดเวลาทวนเป็น 2 ส่วน: (1) อ่านสรุป 20% (2) ทำแบบฝึกหัด 80% เพราะคณิตไม่ใช่วิชาที่ท่องแล้วจบ ยิ่งบทลำดับและอนุกรมกับตรีโกณมิติ ถ้าได้ลงมือทำโจทย์ จะจำได้ยาวและเข้าใจเร็วมาก

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