Xiao Li reads a book, reads (3/7) of this book on the first day, and (1/7) of this book on the second day, and reads less of this book on the second day than on the first day What percentage?
小莉看一本书，第一天看了这本书的(3/7)，第二天看了这本书的(1/7)，第二天比第一天少看这本书的几分之几？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(3/7) - (1/7)</gadget>
<output>2/7 = around 0.285714</output>

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