Simple calculation: (13/12)*((6/13)+12).
简便计算：(13/12)*((6/13)+12)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 13</gadget>
<output>13/2 = around 6.5</output>

<result>13/2 = around 6.5</result>