(3/13)*(4/5)+(10/13)/(5/4)-(4/5).
(3/13)*(4/5)+(10/13)/(5/4)-(4/5)．
<gadget id="calculator">3 / 13</gadget>
<output>3/13 = around 0.230769</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/13) * (4/5)</gadget>
<output>12/65 = around 0.184615</output>

<gadget id="calculator">10 / 13</gadget>
<output>10/13 = around 0.769231</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(10/13) / (5/4)</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(8/13) - (4/5)</gadget>
<output>-12/65 = around -0.184615</output>

<gadget id="calculator">(12/65) + (-12/65)</gadget>
<output>0</output>

<result>0</result>