Calculation: (1/3)*(1/15)+(1/3)*(1/5).
计算：(1/3)*(1/15)+(1/3)*(1/5)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/3) * (1/15)</gadget>
<output>1/45 = around 0.022222</output>

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

<gadget id="calculator">(1/3) * (1/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/45) + (1/15)</gadget>
<output>4/45 = around 0.088889</output>

<result>4/45 = around 0.088889</result>