Calculate how much 1*(3-1)*0.7*28=.
计算1*(3-1)*0.7*28=多少．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">1 * 2 * 0.7 * 28</gadget>
<output>39.2</output>

<result>39.2</result>