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2019 年高中毕业年级第二次质量预测数学（理科）参考答案
一、选择题：
BDBCD CAACD CA
一、填空题：
13.16； 14. ;5
4 15. ;3
2 16. ln 2(0, ].2
三、解答题：
17.解：（1）在数列{
