One factor (except 0) is reduced to its ((())/(())), and the other factor (except 0) is expanded to its multiple, and the product remains unchanged.
一个因数(0除外)缩小到它的((())/(()))，另一个因数(0除外)扩大到它多少的倍，积不变．
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<result>10</result>