Simple calculation: (5/13)+(5/13)+(5/13).
简便计算：(5/13)+(5/13)+(5/13)．
<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">(5/13) + (5/13) + (5/13)</gadget>
<output>15/13 = around 1.153846</output>

<result>15/13 = around 1.153846</result>