Calculation: ((1/6)+(1/7)+(1/8))*((1/7)+(1/8)+(1/9))-((1/6)+( 1/7)+(1/8)+(1/9))*((1/7)+(1/8)).
计算：((1/6)+(1/7)+(1/8))*((1/7)+(1/8)+(1/9))-((1/6)+(1/7)+(1/8)+(1/9))*((1/7)+(1/8))．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/6) + (1/7) + (1/8)</gadget>
<output>73/168 = around 0.434524</output>

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

<gadget id="calculator">(1/7) + (1/8) + (1/9)</gadget>
<output>191/504 = around 0.378968</output>

<gadget id="calculator">(73/168) * (191/504)</gadget>
<output>13_943/84_672 = around 0.164671</output>

<gadget id="calculator">(1/6) + (1/7) + (1/8) + (1/9)</gadget>
<output>275/504 = around 0.545635</output>

<gadget id="calculator">(1/7) + (1/8)</gadget>
<output>15/56 = around 0.267857</output>

<gadget id="calculator">(275/504) * (15/56)</gadget>
<output>1_375/9_408 = around 0.146152</output>

<gadget id="calculator">(13_943/84_672) - (1_375/9_408)</gadget>
<output>1/54 = around 0.018519</output>

<result>1/54 = around 0.018519</result>