Proving inequalities (often using Cauchy/AM-GM) and finding maximum or minimum values of multi-variable expressions. Specific Problem Examples
Common problems identified in recent Yên Phong HSG papers include: Find all positive integers is divisible by Concurrent Lines: Finding so that three lines, such as , intersect at a single point. Circle Geometry: Proving geometric relationships such as using properties of tangents and chords. Resources for Preparation Дђб»Ѓ thi HSG ToГЎn 9 huyện YГЄn Phong
For students and teachers looking for full PDF versions and detailed answer keys, the following platforms regularly host these documents: Resources for Preparation For students and teachers looking
VnDoc : Offers downloadable versions of past papers specifically for Yên Phong district. High-scoring problems typically involving circles
THCS Toanmath : Provides a comprehensive archive of district-level exams with solutions.
Official School Portal : The Trường THCS Yên Phong website occasionally shares provincial and district resources.
High-scoring problems typically involving circles, tangents, and coordinate geometry (e.g., finding parameters for concurrent lines).