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Round 2 · Interactive labRound 2 · 互动练习

Round 2 Lab

Round 2 互动练习

5 modules, 15 questions worked in full, 99 numerical checks.

5 个模块、15 道题完整讲解，共 99 个数值核对点。

These 15 questions are a free full-solution sample of Round 2, grouped by topic. Round 2 papers print no marks for each question, so this lab gives none either: every question has a set of numerical checks, and progress counts the checks you pass. The rest of Round 2 is in the answers-only question bank, with full working in the Round 2 book.

这 15 道题是 Round 2 免费开放完整解答的样章，按专题分组。Round 2 试卷不标每道题的分值，所以这里也不给分：每道题设若干数值核对点，进度统计的是你通过的核对点数。其余 Round 2 真题在只给答案的题库里，完整过程见 Round 2 题解书。

Every module has the same fixed structure: it opens with the background for the topic, then each past-paper question gets its own tab, always in the same order.

每个模块的结构都一样：先讲这一专题的背景知识，然后每道真题单独一页，顺序固定。

1. →Background背景知识
2. then, for each question:然后每道题：
3. 1Question原题
4. 2Analysis题目分析
5. 3Visualisation可视化
6. 4Try it yourself自己算
7. 5Full solution完整解答
8. 6Traps易错点

Each question has several numerical checks; every check you pass counts once, whether or not you opened a hint or the solution. Progress is saved only in this browser.

每道题设若干数值核对点；通过一个就计一个，是否看过提示或解答都不影响。进度只保存在当前浏览器里。

Modules · M1–M5模块 · M1–M5

Beyond the lab练习之外