Calculation: (1/2)+(5/7)+(11/12)+(10/21)+(11/28).
计算：(1/2)+(5/7)+(11/12)+(10/21)+(11/28)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">11 / 12</gadget>
<output>11/12 = around 0.916667</output>

<gadget id="calculator">10 / 21</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">11 / 28</gadget>
<output>11/28 = around 0.392857</output>

<gadget id="calculator">(1/2) + (5/7) + (11/12) + (10/21) + (11/28)</gadget>
<output>3</output>

<result>3</result>