试题与答案

已知等差数列an前17项和S17=51,则a5-a7+a9-a11+a13=____

题型:单项选择题

题目:

已知等差数列an前17项和S17=51,则a5-a7+a9-a11+a13=______.

A.3
B.6
C.17
D.51

答案:

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