(1+(1/3)+(1/4))*((1/3)+(1/4)+(1/5))-(1+(1/3)+(1/4) +(1/5))*((1/3)+(1/4))=how much.
(1+(1/3)+(1/4))*((1/3)+(1/4)+(1/5))-(1+(1/3)+(1/4)+(1/5))*((1/3)+(1/4))=多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 + (1/3) + (1/4)</gadget>
<output>19/12 = around 1.583333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) + (1/4) + (1/5)</gadget>
<output>47/60 = around 0.783333</output>

<gadget id="calculator">(19/12) * (47/60)</gadget>
<output>893/720 = around 1.240278</output>

<gadget id="calculator">1 + (1/3) + (1/4) + (1/5)</gadget>
<output>107/60 = around 1.783333</output>

<gadget id="calculator">(1/3) + (1/4)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(107/60) * (7/12)</gadget>
<output>749/720 = around 1.040278</output>

<gadget id="calculator">(893/720) - (749/720)</gadget>
<output>1/5 = around 0.2</output>

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