A rope is 2 meters long, first use up (3/5) meters, and then use up the remaining (2/5), how many meters are left.
一根绳子长2米，先用去(3/5)米，再用去剩下的(2/5)，还剩多少米．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 - (3/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/5) * (3/5)</gadget>
<output>21/25 = around 0.84</output>

<result>21/25 = around 0.84</result>