Calculation: (2/5)+(2/15)+(1/3).
计算：(2/5)+(2/15)+(1/3)．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

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

<gadget id="calculator">(2/5) + (2/15) + (1/3)</gadget>
<output>13/15 = around 0.866667</output>

<result>13/15 = around 0.866667</result>