According to 725/125=5, 5+504=509, 809-509=300 form a comprehensive formula.
根据725/125=5，5+504=509，809-509=300组成一个综合算式是多少．
<gadget id="calculator">725 / 125</gadget>
<output>29/5 = around 5.8</output>

<gadget id="calculator">(29/5) + 504</gadget>
<output>2_549/5 = around 509.8</output>

<gadget id="calculator">809 - (2_549/5)</gadget>
<output>1_496/5 = around 299.2</output>

<result>1_496/5 = around 299.2</result>