(1/5)*(-(1/4))*(1/3)*(-(1/2))*1*(-2)*3*(-4)*5=how much.
(1/5)*(-(1/4))*(1/3)*(-(1/2))*1*(-2)*3*(-4)*5=多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">-(1/4)</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">(1/5) * (-1/4) * (1/3) * (-1/2) * 1 * (-2) * 3 * (-4) * 5</gadget>
<output>1</output>

<result>1</result>