Lingling reads a book, read the book on the first day (1/4), read the whole book on the second day (3/7), read the book in three days, read the whole book more on the second day than on the third day How much?
玲玲看一本书，第一天看书的(1/4)，第二天看全书的(3/7)，三天看完这本书，第二天比第三天多看全书的几分之几？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (3/7)</gadget>
<output>9/28 = around 0.321429</output>

<gadget id="calculator">(3/7) - (9/28)</gadget>
<output>3/28 = around 0.107143</output>

<result>3/28 = around 0.107143</result>