What is the sum of all the proper fractions whose denominator is 12?
分母是12的所有真分数的和是多少．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">6 / 12</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">8 / 12</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 / 12</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">10 / 12</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(1/12) + (1/6) + (1/4) + (1/3) + (5/12) + (1/2) + (7/12) + (2/3) + (3/4) + (5/6) + (11/12)</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>