((5+6)/(5*6))-((6+7)/(6*7))+((7+8)/(7*8))-((8+9)/( 8*9))+((9+10)/(9*10)).
((5+6)/(5*6))-((6+7)/(6*7))+((7+8)/(7*8))-((8+9)/(8*9))+((9+10)/(9*10))．
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">11 / 30</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">13 / 42</gadget>
<output>13/42 = around 0.309524</output>

<gadget id="calculator">(11/30) - (13/42)</gadget>
<output>2/35 = around 0.057143</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">15 / 56</gadget>
<output>15/56 = around 0.267857</output>

<gadget id="calculator">8 + 9</gadget>
<output>17</output>

<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<gadget id="calculator">17 / 72</gadget>
<output>17/72 = around 0.236111</output>

<gadget id="calculator">(15/56) - (17/72)</gadget>
<output>2/63 = around 0.031746</output>

<gadget id="calculator">9 + 10</gadget>
<output>19</output>

<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">19 / 90</gadget>
<output>19/90 = around 0.211111</output>

<gadget id="calculator">(2/35) + (2/63) + (19/90)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>