Column calculation: how much less is the difference between 4.3 and 1.6 than their sum?
列式计算：4.3与1.6的差比它们的和，少多少？
<gadget id="calculator">4.3 + 1.6</gadget>
<output>5.9</output>

<gadget id="calculator">4.3 - 1.6</gadget>
<output>2.7</output>

<gadget id="calculator">5.9 - 2.7</gadget>
<output>3.2</output>

<result>3.2</result>