湖南省衡阳县第四中学2018_2019学年高二数学12月月考试题(扫描版).doc

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12345参考答案一、选择题题号 1 2 3 4 5 6 7 8 9 10 11 12答案 A B B A C A B A A B B A二、填空题13. 答案:(,0) ,)1214.答案:1515. 答案:3516. 答案: 1 或 1x2100 y264 y2100 x264三、解答题17.解析:(1)依题意,由余弦定理得cos C .42 52 61 2245 120bc,顶点 B 的轨迹方程为 1(2 x0)x24 y237

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