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计算：9÷13＋13÷9＋11÷13＋14÷9＋6÷13=．计算：9÷13+13÷9+11÷13+14÷9+6÷13=．

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You should spend about 20 minutes on this task.The pie charts below give information aboutYou should spend about 20 minutes on this task. The pie charts below give information about the household expenditure of two average U.S. families in different years. Summaries the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.

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