There are 21 apples distributed equally to 7 children, and each child gets all ((())/(())).
有21个苹果平均分给7个小朋友，每个小朋友分得全部的((())/(()))．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

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