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1、龙文教育 陈娟1ACB2011 年浙江省湖州市中考数学试题一、选择题（本题共 10 小题，每小题 3 分，满分 30 分） 15 的相反数是【 】A5 B5 C D1 51 5 2计算 a2a3，正确的结果是【 】 A2a6 B2a5 Ca6 Da5 3根据全国第六次人口普查统计，湖州市常住人口约为人，近似数用科学记数法可表示为【 】 A2.89104 B2.89105 C2.89106 D2.89107 4如图，在ABC 中，C90，BC1，AC2，则 tanA 的值为【 】A2 B C D1 2 5数据 1、2、3、4、5 的平均数是【 】 A1 B2 C3 D4 6下列事件中，必然事件是
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