(1+(1/2)+(2/3)+(3/4))*((1/2)+(2/3)+(3/4)+(4/5))-(1 +(1/2)+(2/3)+(3/4)+(4/5))*((1/2)+(2/3)+(3/4))
(1+(1/2)+(2/3)+(3/4))*((1/2)+(2/3)+(3/4)+(4/5))-(1+(1/2)+(2/3)+(3/4)+(4/5))*((1/2)+(2/3)+(3/4))
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (1/2) + (2/3) + (3/4)</gadget>
<output>35/12 = around 2.916667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/2) + (2/3) + (3/4) + (4/5)</gadget>
<output>163/60 = around 2.716667</output>

<gadget id="calculator">(35/12) * (163/60)</gadget>
<output>1_141/144 = around 7.923611</output>

<gadget id="calculator">1 + (1/2) + (2/3) + (3/4) + (4/5)</gadget>
<output>223/60 = around 3.716667</output>

<gadget id="calculator">(1/2) + (2/3) + (3/4)</gadget>
<output>23/12 = around 1.916667</output>

<gadget id="calculator">(223/60) * (23/12)</gadget>
<output>5_129/720 = around 7.123611</output>

<gadget id="calculator">(1_141/144) - (5_129/720)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>