2.1/1.7*5.1/159.1*3.7/0.7．
2.1/1.7*5.1/159.1*3.7/0.7．
<gadget id="calculator">2.1 / 1.7</gadget>
<output>1.235294</output>

<gadget id="calculator">5.1 / 159.1</gadget>
<output>0.032055</output>

<gadget id="calculator">3.7 / 0.7</gadget>
<output>5.285714</output>

<gadget id="calculator">1.235294 * 0.032055 * 5.285714</gadget>
<output>0.2093</output>

<result>0.2093</result>