A rope is (5/2) meters long, if (2/5) is cut off, how many meters are left?
一条绳子长(5/2)米，剪去(2/5)，还剩下多少米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</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">(5/2) * (3/5)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>