The road repair team repaired a road, and repaired (3/5) kilometers in the first week, (5/6) kilometers in the second week, and (3/15) kilometers less than the sum of the previous two weeks in the third week, How many kilometers did you repair in the third week?
修路队修一条公路，第一周修了(3/5)千米，第二周修了(5/6)千米，第三周比前两周修的总和少(3/15)千米，第三周修了多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(5/6) - (5/13)</gadget>
<output>35/78 = around 0.448718</output>

<gadget id="calculator">(3/5) + (35/78)</gadget>
<output>409/390 = around 1.048718</output>

<result>409/390 = around 1.048718</result>