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    In the Rt△ABC，∠ACB＝90°，AB＋BC＋CA＝2＋，midline for hypotenuse（斜边）is 1，then AC·BC＝__________．

    1

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    　　One day, Chen Hui’s class 　　1　　 an English exam．The teacher marked(给……打分)the students’ paper and then gave them 　　2　　 to the students．Chen Hui looked at his paper．He saw his mark was 85．

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