Subtract 3 (1/10) kilograms from 6 (1/10) kilograms, leaving ((())/(())) kilograms.
6个(1/10)千克减3个(1/10)千克，还剩((())/(()))千克．
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/5) - (3/10)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>