Try it out and do the math: (1+(1/3)+(1/5))*((1/3)+(1/5)+(1/7))-(1+(1/5) 3)+(1/5)+(1/7))*((1/3)+(1/5))
试一试，算一算：(1+(1/3)+(1/5))*((1/3)+(1/5)+(1/7))-(1+(1/3)+(1/5)+(1/7))*((1/3)+(1/5))
<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 + (1/3) + (1/5)</gadget>
<output>23/15 = around 1.533333</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">(23/15) * (71/105)</gadget>
<output>1_633/1_575 = around 1.036825</output>

<gadget id="calculator">1 + (1/3) + (1/5) + (1/7)</gadget>
<output>176/105 = around 1.67619</output>

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(176/105) * (8/15)</gadget>
<output>1_408/1_575 = around 0.893968</output>

<gadget id="calculator">(1_633/1_575) - (1_408/1_575)</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>