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【单选题】

等比数列an中,a5+a1=34,a5-a1=30,则a3=().

A、5
B、-5
C、-8
D、8
E、±9
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根据网考网移动考试中心的统计,该试题:

9%的考友选择了A选项

25%的考友选择了B选项

3%的考友选择了C选项

63%的考友选择了D选项

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