免费练习 · Free Practice

给准备英国大学与考试的同学的免费资源，先从 STEP 开始。
Free practice resources for pupils preparing for UK university admissions and exams. We start with STEP.

怎么知道自己做对没有？ 每道题做完点开「解答和自查清单」：先对照「一份对的解答必须有的几步」逐条勾，再看「最容易断的地方」，最后读作者的完整解答。

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Problems and solutions are reproduced from Stephen Siklos, Advanced Problems in Mathematics: Preparing for University, Second Edition (Cambridge, UK: Open Book Publishers, 2019), https://doi.org/10.11647/OBP.0181, licensed under CC BY 4.0. STEP questions are reproduced in that book by kind permission of Cambridge Assessment Group Archives.

题目与解答出自 Stephen Siklos《Advanced Problems in Mathematics》（2019 第二版，开放许可 CC BY 4.0）。