รูปประกอบการพิสูจน์ทฤษฎีบท 3 (เวกเตอร์)
สื่อประกอบหนังสือเรียน สสวท. ม.5 เพิ่มเติม เล่ม 1 หน้า 263
- Grup Ţintă (Vârstă)
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