When Xiao Ming reads a book, he has already read (3/7) of the whole book. What percentage of the whole book has he not read more than he has read?
小明看一本书，已经看了全书的(3/7)，没有看的比已经看的多全书的几分之几？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>