There are three colored ribbons, the red one is (1/3) meter longer than the yellow one, and (1/5) meter shorter than the blue one, and the longest ribbon is ((())/(())) meters longer than the shortest one.
有三条彩带，红色的比黄色的长(1/3)米，比蓝色的短(1/5)米，最长的彩带比最短的长((())/(()))米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>