How much is it to form a comprehensive formula of 500/125=4, 4+40=48, 84-48=36.
把500/125=4，4+40=48，84-48=36组成一个综合算式是多少．
<gadget id="calculator">500 / 125</gadget>
<output>4</output>

<gadget id="calculator">4 + 40</gadget>
<output>44</output>

<gadget id="calculator">84 - 44</gadget>
<output>40</output>

<result>40</result>