The former term of the ratio remains unchanged, and the latter term is reduced to the original (1/5), the ratio is expanded to how many times the original
比的前项不变，后项缩小到原来的(1/5)，比值就扩大到原来的多少倍
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<result>5</result>