A steel pipe has 6 meters left after (2/5) of it is used up, and how many meters is left after (1/2) of it is used up.
一根钢管用去它的(2/5)后还余6米，用去它的(1/2)后，余下多少米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">1 - (5/2)</gadget>
<output>-3/2 = around -1.5</output>

<gadget id="calculator">6 / (-3/2)</gadget>
<output>-4</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(-3/2) / (3/5)</gadget>
<output>-5/2 = around -2.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(-4) * (-5/2) * (1/2)</gadget>
<output>5</output>

<result>5</result>