1 ton (3/5) weighs as much as 3 tons.
1吨的(3/5)和3吨的多少一样重．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 * (1/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>