(4/5)/(((3/5)-(1/4))/(7/10)).
(4/5)/(((3/5)-(1/4))/(7/10))．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/20) / (7/10)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) / (1/2)</gadget>
<output>8/5 = around 1.6</output>

<result>8/5 = around 1.6</result>