Xiaohua borrowed a book from the school library, read this book on the first day (2/7), read this book on the second day (3/7), and read this book in two days What fraction of?
小华从学校图书室借来一本书，第一天看了这本书的(2/7)，第二天看了这本书的(3/7)，两天一共看了这本书的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(2/7) + (3/7)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>