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

<result>1/5 = around 0.2</result>