((5/11)+(4/13))*11+8/13.
((5/11)+(4/13))*11+8/13．
<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">(5/11) + (4/13)</gadget>
<output>109/143 = around 0.762238</output>

<gadget id="calculator">(109/143) * 11</gadget>
<output>109/13 = around 8.384615</output>

<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(109/13) + (8/13)</gadget>
<output>9</output>

<result>9</result>