(1.42-0.56)*0.25/2.15．
(1.42-0.56)*0.25/2.15．
<gadget id="calculator">1.42 - 0.56</gadget>
<output>0.86</output>

<gadget id="calculator">0.25 / 2.15</gadget>
<output>0.116279</output>

<gadget id="calculator">0.86 * 0.116279</gadget>
<output>0.1</output>

<result>0.1</result>