For problem sets 1-4, the solutions are to be written out carefully and legibly, in good mathematical style.

对于作业1-4，解答要用严谨的数学格式仔细清晰的写下来。

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Advertisement copy must be legibly written by the advertiser with the size of the advertisement and the date of insertion endorsed by a signature.

广告来稿须书写清楚，并注明广告尺寸和刊登日期，且须有客户签名作实。

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