Xiaohong reads the comic strips of "Journey to the West", read (2/7) of this book on the first day, and (3/7) of this book on the second day, and still have a fraction of this book I did not see?
小红看《西游记》连环画，第一天看了这本书的(2/7)，第二天看了这本书的(3/7)，还剩下这本书的几分之几没看？
<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">1 - (2/7) - (3/7)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>