(1+(1/3)+(1/5)+(1/7))*((1/3)+(1/5)+(1/7)+(1/9))-(1 +(1/3)+(1/5)+(1/7)+(1/9))*((1/3)+(1/5)+(1/7)).
(1+(1/3)+(1/5)+(1/7))*((1/3)+(1/5)+(1/7)+(1/9))-(1+(1/3)+(1/5)+(1/7)+(1/9))*((1/3)+(1/5)+(1/7))．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/3) + (1/5) + (1/7)</gadget>
<output>71/105 = around 0.67619</output>

<gadget id="calculator">1 / (71/105)</gadget>
<output>105/71 = around 1.478873</output>

<gadget id="calculator">1 + (105/71)</gadget>
<output>176/71 = around 2.478873</output>

<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<gadget id="calculator">(105/71) + 9</gadget>
<output>744/71 = around 10.478873</output>

<gadget id="calculator">(176/71) * (744/71)</gadget>
<output>130_944/5_041 = around 25.975798</output>

<gadget id="calculator">1 + (105/71) + 9</gadget>
<output>815/71 = around 11.478873</output>

<gadget id="calculator">(815/71) * (105/71)</gadget>
<output>85_575/5_041 = around 16.975798</output>

<gadget id="calculator">(130_944/5_041) - (85_575/5_041)</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>