If 3.7 in 3.7*2.1 is expanded by 10 times, to ensure the result remains unchanged, 2.1 should be reduced to the original amount.
如果将3.7*2.1中的3.7扩大10倍，要保证结果不变，2.1应缩小为原来的多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>