2025AIME2 P3--Log Telescoping Product: Simplify the Chain of Bases

 2025AIME2 P2--Divisibility Puzzle: Sum of n with (n+2) | 3(n+3)(n²+9)

 2025AIME2 P1-Six Collinear, One Off-Line: Area of △BGE (Geometry/Coordinates)

 2019AMC12A P25 SOL2--Angle Iteration Map & Invariant Linearization

 2019AMC12A P25 SOL1--Iterative Geometry

 2019AMC12A P24--Factorials/Valuation

 2019AMC12A P23 SOL2--Log Transform & Closed-Form Recurrence

 2019AMC12A P23 SOL1--Strange Operation/Logs

 2019AMC12A P22--Invariant/Monovariant

 2019AMC12A P21 SOL2--Root Pairing & Modulus-Conjugate

 2019AMC12A P21 SOL1--Complex/Roots of Unity

 2019AMC12A P20--Triangle Lengths

 2019AMC12A P19--Lattice Paths

 2019AMC12A P18--Complex Fractions

 2019AMC12A P17--Vectors/Analytic Geo

 2019AMC12A P16--Number Theory Build

 2019AMC12A P15--Quadratic Vertex

 2019AMC12A P14--Combinatorics

 2019AMC12A P13--System Tricks

 2019AMC12A P12--Circles/Power

 2019 AMC12A P11--Inequalities

 2019 AMC12A P10--Probability/Counting

 2019 AMC12A P9--Function & Equation

 2019 AMC12A P7--Divisibility/Residue

 2019 AMC12A P6--Series & Telescoping

 2019 AMC12A P5--Means/Weighted Average

 2019 AMC12A P4--Quadratic Basics

 2019 AMC12A P3--Geometry Similarity

 2019 AMC12A P2--Ratio & Fraction Simplify

 2019 AMC12A P1--Quick Algebra Check

 2019 AMC12B P25 SOL2

 2019 AMC12B P25 SOL1--Max Area Quadrilateral Given Centroids

 2019 AMC12B P24--Coordinate & Vector Geometry Problem

 2019 AMC12B P23 SOL2

 2019 AMC12B P23 SOL1--Convex Quadrilateral and Area Bound

 2019 AMC12B P22 SOL2

 2019 AMC12B P22 SOL1--Maximum Quadrilateral Area with Constraints

 2019 AMC12B P21--Convex Quadrilateral & Centroid 

 2019 AMC12B P20--Tangents and Circle Geometry

 2019 AMC12B P19--Count Binary Sequences with Const

 2019 AMC12B P18--Quadratics Where Roots = Coefficients

 2019 AMC12B P17--Recursive Sequence Interval Estimation

 2019 AMC12B P16--Complex Numbers & Equilateral Triangle

 2019 AMC12B P15-- Frog Jumping Probability

 2019 AMC12B P14--Area Between Circle and Semicircles

 2019 AMC12B P13--Products of Distinct Divisors

 2019 AMC12B P12--Probability with Colored Balls

 2019 AMC12B P11--Isosceles Triangle and Equal Perimeter Conditions

 2019 AMC 12B P10--Unordered Pairs of Edges in a Cube

 2019 AMC 12B P9--Counting Paths in a Graph

 2019 AMC 12B P8-- Counting Integer-Sided Triangles

 2019 AMC 12B P6--Points Satisfying Perimeter & Area Conditions

 2019 AMC 12B P5--Locus and Equidistance Conditions

 2019 AMC 12B P4--Sum of Digits via Algebraic Equation

 2019 AMC 12B P3--Rigid Transformations on the Coordinate Plane

 2019 AMC 12B P2--Counterexample in Logic

 2019 AMC 12B P1--Volume Ratio Basics

 2018 F=ma EXAM A P25--Combining Independent Measurements

 2018 F=ma EXAM A P24--Rigid Rod + Mass: Axis Pivot Oscillation

 2018 F=ma EXAM A P23--Angular Acceleration on Sloped Ramp

 2018 F=ma EXAM A P22--Leak Rate vs Time in Sinking Boat

 2018 F=ma EXAM A P21--Rolling Ping-Pong Ball: Slip to Roll Transition

 2018 F=ma EXAM A P20-Energy Storage in Cut vs Whole Spring

 2018 F=ma EXAM A P19--Rain Pressure Changes: Density, Radius, Speed

 2018 F=ma EXAM A P18--Tension Difference in Vertical Circular Motion

 2018 F=ma EXAM A P17-- Shape of Sand Stream after Helicopter Turn

 2018 F=ma EXAM A P16--Coriolis Effect in Rotating Space Station

 2018 F=MA EXAM A P15-- Kinetic Energy Increase in Circular Orbit

 2018 F=MA EXAM A P14--Oscillation Periods in Tri-Rod Pendulu

 2018 F=MA EXAM A P13--Young’s Modulus via Tightrope Tension

 2018 F=MA EXAM A P12-- Uncertainty in Pendulum Experiment

 2018 F=MA EXAM A P11-- Half-Spring Frequency Doubling

 2018 F=MA EXAM A P10--Acceleration vs Time with Air Drag

 2018 F=MA EXAM A P9--Forces on a Rod Being Lifted by a Rope

 2018 F=ma EXAM B P8--Rolling Disk within a Hoop: Instantaneous Speed

 2018 F=ma EXAM B P7--Minimum Time for a to–b Maneuver with Braking

 2018 F=ma EXAM B P6--Crate Rolling Up a Ramp with Friction

 2018 F=ma EXAM B P5--Inclined Plane & Pulley Momentum Puzzle

 2018 F=ma EXAM A P4--

2018 F=ma EXAM A P4--Optimal Impulse Application in Orbit

Optimal Impulse Application in Orbit

 2018 F=ma EXAM B P3--Optimal Impulse Application in Orbit

 2018 F=ma EXAM B P2--Conservation Exceptions in Collision

 2018 F=ma EXAM A P1--Velocity Graph with Air Resistance

 2024AMC 12B P25--Symmetry of Rational Functions

 2024AMC 12B P24--Exploring the Disphenoid Mystery

 2024AMC 12B P23 SOL2--Elegant Identities in Action

 2024AMC 12B P23 SOL1--Trig Products Made Easy

 2024AMC 12B P22 SOL2--Counting Loops with Logic

 2024AMC 12B P22 SOL1--The Toothpick Puzzle Explained

 2024AMC 12B P21 SOL2--Sum of Squares the Smart Way

 2024AMC 12B P21 SOL1--Mastering the Recurrence Trick

 2024AMC 12B P20--Triangle Probability: Area Less Than Half?

 2024AMC 12B P19--Cyclic Quadrilateral: What’s the Shortest Diagonal?

 2024AMC 12B P18--Stacking Cards: When Will a Vertex Land on B?

 2024AMC 12B P17--System of Three: What’s the Value of ab + bc + ca?

 2024AMC 12B P16-- ProToken Distribution: What’s the Probability for Each Player?

 2024AMC 12B P15--Cubic Roots Product: A Surprising Value!

 2024AMC 12B P14--Arithmetic Grid: Can You Fill in the Missing Number?

 2024AMC 12B P13--Graph Symmetry: Where Is the Reflected Point?

 2024AMC 12B P12--Geometric Sequence: What’s the Smallest Possible b?

 2024AMC 12B P11--Base Trick: For Which b Is 2024\_b Divisible by 16?

 2024AMC 12B P10--Triangle Angles in Radians: Connecting α and β

 2024AMC 12B P9--Double Perfect Square Riddle: What’s the Unit Digit?

 2024AMC 12B P8--Logarithm Equation: How Many Angles Can You Find?

 Dialogues with Dr. Wang 7/7 Juntao’s Final Words

 Dialogues with Dr. Wang 6/7 Social Justice and Youth Responsibility A Message to the Next Generation

 Dialogues with Dr. Wang 5/7 The Global Trend of Democracy and the Meaning of Individual Action

 Dialogues with Dr. Wang 4/7 U.S. Education vs. Chinese Youth Development

 Dialogues with Dr. Wang 2/7 Freedom, Justice, and the Real Challenges Facing Chinese Society

 Dialogues with Dr. Wang 2/7China-U.S. Relations and Economic Prospects after Trump’s Re-election

 Dialogues with Dr. Wang Juntao 1/7 Juntao’s Story and the Era of China-U.S. Civilization Clash

 2024AMC 12B P7-- Vector Sum Parade: 2024 Points on a Hypotenuse

 2024AMC 12B P6-- Product of Three: The Least Positive Sum Game

 2024AMC 12B P5--Mean Mystery: How Many 6s Did You Remove?

 

2024AMC 12B P4--Factorial Showdown: What’s the Least n for 2024 Divisibility?

 2024AMC 12B P3--Minimal Number Puzzle: The Fewest Steps to 2024

 2024AMC 12B P2-- Path to the Top: Can You Solve This Mountain Hike Problem?

 2024AMC 12B P1--Quick Calculation Challenge: Can You Outsmart This Arithmetic?

 2024AMC 12A P25 SOL2--Systematic Enumeration: Filter Out the Solutions

 2024AMC 12A P25 SOL1--Symmetry Attack: Algebraic Perspective

 2024AMC 12A P24 SOL2--Using Formulas: Heron's Formula for the Win

 2024AMC 12A P24 SOL1- Parameter Hunt: Enumerating All Possibilities

 2024AMC 12A P23 SOL2--Smart Substitution: Plug and Play for Tangents

 2024AMC 12A P23 SOL1--Clever Identity: Transform and Conquer Tangents!

 2024AMC 12A P22--Combinatorics in Action: Counting the Loops

 2024AMC 12A P21 SOL2-- Formula Derivation: Summing Squares the Fast Way

 2024AMC 12A P21 SOL1--Sequence Recurrence: Huge Sum Challenge!

 2024AMC 12A P20--Triangle Probability: Less Than Half the Area?

 2024AMC 12A P19--Cyclic Quadrilateral Quest: The Shortest Diagonal

 2024AMC 12A P18--Card Stacking&Geometry Vertex Miracle

 2024AMC 12A P17--System of Three: Find ab + bc + ca

 2024AMC 12A P16--Token Distribution: What’s the Winning Probability?

 2024AMC 12A P15--Cubic Roots & Products: What’s the Value?

 2024AMC 12A P14--Arithmetic Array: Can You Crack the Grid?

 2024AMC 12A P13--Exponential Graph Symmetry: Reflected Points

 2024AMC 12A P12--Geometric Sequence Surprise: Least Possible Value

 2024AMC 12A P11-- Divisibility in Any Base: Base-b Number Tricks

 2024AMC 12A P10--Triangle Angle Radians: Relating α and β

 2024AMC 12A P8-- Trig Log Equation: How Many Angles?

 2024AMC 12A P7--Vector Parade in a Right Triangle

 2024AMC 12A P5--Mean Switcheroo: The Mystery of Disappearing 6s

 2024AMC 12A P3--Minimal Sum Challenge: How Few Numbers Do You Need?

 2024AMC 12A P2-- Mountain Hike Model: Linear System Puzzle