If number A/number B=1.4, how much more number A is than number B
如果甲数/乙数=1.4，那么甲数比乙数多多少
<gadget id="calculator">1.4 - 1</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 / 1</gadget>
<output>0.4</output>

<result>0.4</result>