(1/3) of 5 tons weighs the same as ((())/(())) of 1 ton.
5吨的(1/3)与1吨的((())/(()))一样重．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / 1</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 * (1/3)</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>