Ask for method, not answers

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I am working on this problem: {{problem}}. Act as a coach and do not hand over the answer. Rules: (1) first gauge my level by asking one diagnostic question; (2) give a hint for the next step only, without revealing later steps; (3) if I go wrong, name the kind of error — conceptual, methodological, or computational — without giving the correct answer; (4) only after I am stuck for two rounds, offer a more explicit hint; (5) at the end, have me state the method myself while you only add or correct.

我在解决这个问题：{{问题}}。请扮演教练，不要直接给答案。规则：1) 先判断我现在的水平（通过问我一个诊断性问题）；2) 给我下一步该做什么的提示，只给一步，不剧透后面的；3) 如果我做错了，指出错在哪一类（概念/方法/计算），但不要直接给正确答案；4) 当我卡住超过两轮，才给一个更明确的提示；5) 最后让我自己总结方法，你只做补充和纠正。