若等差数列的第5项与第9项的和是<img src="20190809/1565313968381221.jpg" title="1565313968381221.jpg" alt="图片1.jpg"/>，则第7项是( )

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【单选题】【消耗次数：1】

① 17

② <img src="20190809/1565314056237133.jpg" title="1565314056237133.jpg" alt="图片2.jpg"/>

③ <img src="20190809/1565314063320431.jpg" title="1565314063320431.jpg" alt="图片3.jpg"/>

④ <img src="20190809/1565314087872850.jpg" title="1565314087872850.jpg" alt="图片4.jpg"/>

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