A (14/15) meter long rope, the first use of the full length (1/5), the second use of the full length (2/3), leaving a few fractions of the full length ?
一根(14/15)米长的绳子，第一次用去全长的(1/5)，第二次用去全长的(2/3)，还剩下全长的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (1/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>