(8/13)/7+(1/7)*(6/13).
(8/13)/7+(1/7)*(6/13)．
<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(8/13) / 7</gadget>
<output>8/91 = around 0.087912</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

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

<gadget id="calculator">(1/7) * (6/13)</gadget>
<output>6/91 = around 0.065934</output>

<gadget id="calculator">(8/91) + (6/91)</gadget>
<output>2/13 = around 0.153846</output>

<result>2/13 = around 0.153846</result>