What is the quotient of the difference of 3.5 minus 0.5 divided by their sum?
3.5减去0.5的差，除以它们的和，商是多少？
<gadget id="calculator">3.5 - 0.5</gadget>
<output>3</output>

<gadget id="calculator">3.5 + 0.5</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>