According to 500/125=4, 4+404=408, 804-408=396 form a comprehensive formula.
根据500/125=4，4+404=408，804-408=396组成一个综合算式是多少．
<gadget id="calculator">500 / 125</gadget>
<output>4</output>

<gadget id="calculator">4 + 404</gadget>
<output>408</output>

<gadget id="calculator">804 - 408</gadget>
<output>396</output>

<result>396</result>