((((8+9+10)/7)-((9+10+11)/8)+((10+11+12)/9)-((11+12+13)/10)) /((1/7)-(1/8)+(1/9)-(1/10)))=how much.
((((8+9+10)/7)-((9+10+11)/8)+((10+11+12)/9)-((11+12+13)/10))/((1/7)-(1/8)+(1/9)-(1/10)))=多少．
<gadget id="calculator">8 + 9 + 10</gadget>
<output>27</output>

<gadget id="calculator">27 / 7</gadget>
<output>27/7 = around 3.857143</output>

<gadget id="calculator">9 + 10 + 11</gadget>
<output>30</output>

<gadget id="calculator">30 / 8</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(27/7) - (15/4)</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">10 + 11 + 12</gadget>
<output>33</output>

<gadget id="calculator">33 / 9</gadget>
<output>11/3 = around 3.666667</output>

<gadget id="calculator">11 + 12 + 13</gadget>
<output>36</output>

<gadget id="calculator">36 / 10</gadget>
<output>18/5 = around 3.6</output>

<gadget id="calculator">(11/3) - (18/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(3/28) + (1/15)</gadget>
<output>73/420 = around 0.17381</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">(1/7) - (1/8)</gadget>
<output>1/56 = around 0.017857</output>

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

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/9) - (1/10)</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">(1/56) + (1/90)</gadget>
<output>73/2_520 = around 0.028968</output>

<gadget id="calculator">(73/420) / (73/2_520)</gadget>
<output>6</output>

<result>6</result>