Tutor-visible context
Student context
Problem context
学生明确要求核对答案和完整解法，因此可以展示完整步骤。
Learning objective
核对学生提出的解法，并清楚地解释怎样验证。
Context window
Conversation history
No prior conversation. This case starts with the current student message.
Public boundary
What this page does not expose
This public development artifact intentionally excludes ground truth answers, known-misconception annotations, rubrics, and evaluator-only evidence. A future hidden challenge dataset must use the same fail-closed serialization boundary.