(5/6)*(1/13)+(5/9)*(2/13)+(5/18)*(6/13).
(5/6)*(1/13)+(5/9)*(2/13)+(5/18)*(6/13)．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">(5/6) * (1/13)</gadget>
<output>5/78 = around 0.064103</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">2 / 13</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">(5/9) * (2/13)</gadget>
<output>10/117 = around 0.08547</output>

<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">(5/18) * (6/13)</gadget>
<output>5/39 = around 0.128205</output>

<gadget id="calculator">(5/78) + (10/117) + (5/39)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>