Calculation: (1-(1/2))(1-(1/3))(1-(1/4))…(1-(1/10))(1+(1/2))(1 +(1/3))(1+(1/4))...(1+(1/10)).
计算：(1-(1/2))(1-(1/3))(1-(1/4))…(1-(1/10))(1+(1/2))(1+(1/3))(1+(1/4))…(1+(1/10))．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">1 + 10</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">(1/10) * (11/2)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>