Xiaohong and Xiaofang read the same comic book, Xiaohong has already read (3/7) of the whole book, Xiaofang has read (1/7) of the whole book, and the rest has not been read.
小红和小芳看一本同样的漫画书，小红已经看了全书的(3/7)，小芳已看了全书的(1/7)，剩下多少没看．
<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">1 - (3/7) - (1/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>