等差数列中，若，，则前9项的和等于_刷题宝

题干

等差数列

中，若

，

，则前9项的和

等于

A：99

B：66

C：144

D：297

上一题下一题 0.0难度选择题更新时间:2016-07-05 10:31:32

答案(点此获取答案解析）

A

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