In multiplication, one factor (not 0) is doubled, and the other factor (not 0) is also doubled, how many times the product is doubled
在乘法里，一个因数(不为0)扩大2倍，另一个因数(不为0)也扩大2倍，积扩大多少倍
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>