(0.25-0.1/2)*(5/13)+1/(13/12).
(0.25-0.1/2)*(5/13)+1/(13/12)．
<gadget id="calculator">0.1 / 2</gadget>
<output>0.05</output>

<gadget id="calculator">0.25 - 0.05</gadget>
<output>0.2</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">0.2 * (5/13)</gadget>
<output>0.076923</output>

<gadget id="calculator">13 / 12</gadget>
<output>13/12 = around 1.083333</output>

<gadget id="calculator">1 / (13/12)</gadget>
<output>12/13 = around 0.923077</output>

<gadget id="calculator">0.076923 + (12/13)</gadget>
<output>1</output>

<result>1</result>