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📚 Course 5, term 2 🥰

# Online Course # phorbantutor # review # Bank, butler, math tutoring # Study online

2025/2/19 Edited to

หลายคนถามว่า “คณิตม.5 เรียนอะไรบ้าง” โดยเฉพาะเทอม 2 แล้วควรเริ่มติวตรงไหนก่อนถึงจะเห็นผล เราเลยขอมาเสริมจากมุมคนที่เคยเรียนคอร์สติวคณิตศาสตร์ ม.5 แบบออนไลน์เหมือนกัน เผื่อช่วยตัดสินใจได้ง่ายขึ้น และรู้ว่าควรเตรียมตัวยังไงให้คุ้มที่สุด ภาพรวมเนื้อหาคณิต ม.5 เทอม 2 ที่มักเจอในโรงเรียนจะมีบทที่ “ต้องทำโจทย์ให้เยอะ” มากกว่าท่องจำ เช่น หลักการนับเบื้องต้น (การจัดเรียงสับเปลี่ยน/การจัดหมู่) และจำนวนเชิงซ้อน ซึ่งสองบทนี้ตอนแรกเราเองก็งง เพราะมันต้องจับ “วิธีคิด” ให้ได้ก่อน ไม่ใช่จำสูตรอย่างเดียว 1) หลักการนับเบื้องต้น: จุดที่พลาดบ่อย - แยกให้ออกว่าโจทย์เป็น “เรียงลำดับ” (สับเปลี่ยน) หรือ “ไม่สนลำดับ” (จัดหมู่) - อ่านเงื่อนไขให้ครบ เช่น ห้ามติดกัน/ต้องอยู่ตำแหน่งนี้/มีของซ้ำ ฯลฯ แล้วค่อยเลือกวิธี - วิธีที่ช่วยเราได้มากคือทำเป็นขั้น ๆ: ตั้งโจทย์ย่อย → นับแต่ละส่วน → คูณ/บวกตามหลักการนับ เวลาเลือกติวเตอร์คณิต ลองดูว่าเขาสอนให้เราตั้งโจทย์เป็นระบบไหม เพราะบทนี้ถ้า “ตั้งโจทย์ผิด” จะผิดทั้งข้อ 2) จำนวนเชิงซ้อน: สิ่งที่ควรฝึกให้คล่อง - การแปลงรูป a+bi และการจัดการกับ i (เช่น i^2=-1) - การบวก ลบ คูณ หาร (โดยเฉพาะการหารที่ต้องคูณด้วยสังยุค) - ฝึกโจทย์ที่ผสมหลายขั้น จะช่วยให้สอบไม่ตื่นเต้น ทริคส่วนตัวของเราคือทำสรุปสูตร/ขั้นตอนสั้น ๆ ไว้หน้าเดียว แล้วทำโจทย์ซ้ำจนมือจำ เช่น “หารจำนวนเชิงซ้อนต้องคูณด้วยสังยุคเสมอ” 3) จะรู้ได้ไงว่าคอร์สติวคณิต ม.5 เหมาะกับเรา - มีแบบฝึกหัดและเฉลยละเอียด (ไม่ใช่เฉลยสั้น ๆ) - มีโจทย์หลายระดับ: พื้นฐาน → กลาง → ข้อสอบจริง - มีวิธีเช็กความเข้าใจ เช่น แบบทดสอบท้ายบท/การบ้าน/สรุปก่อนสอบ - สไตล์การสอน: เราแนะนำให้ดูคลิปตัวอย่างก่อนเสมอ เพราะบางคนชอบเร็ว บางคนชอบช้าและละเอียด 4) แผนอ่าน+ทำโจทย์ 7 วันก่อนสอบ (ที่เราใช้แล้วเวิร์ก) - วัน 1-2: ทบทวนสรุป + ทำโจทย์พื้นฐานให้ครบทุกหัวข้อ - วัน 3-5: ทำโจทย์ข้อสอบ/โจทย์ประยุกต์ จับเวลา - วัน 6: เก็บข้อที่ผิด ทำ “สมุดข้อผิดพลาด” ว่าพลาดเพราะอะไร - วัน 7: ทวนสมุดข้อผิดพลาด + สูตรสำคัญ โดยเฉพาะหลักการนับและจำนวนเชิงซ้อน หวังว่าส่วนเสริมนี้จะช่วยให้คนที่กำลังหา “ติวคณิตศาสตร์ ม.5” หรือยังไม่แน่ใจว่า “คณิตม.5 เรียนอะไรบ้าง” เห็นภาพมากขึ้น ถ้าจะให้แนะนำแบบสรุปคือ: เลือกคอร์ส/ติวเตอร์ที่สอนเป็นขั้นตอนและให้ทำโจทย์เยอะ ๆ แล้วผลจะชัดมาก โดยเฉพาะสองบทนี้ที่ฝึกแล้วคะแนนขึ้นไวจริง ๆ

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