If a=(5/6), b=(7/12), c=(9/20), d=(11/30), e=(13/42), then a-b+c-d+ e=how much.
若a=(5/6)，b=(7/12)，c=(9/20)，d=(11/30)，e=(13/42)，则a-b+c-d+e=多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(5/6) - (7/12)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

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

<gadget id="calculator">(9/20) - (11/30)</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">(1/4) + (1/12) + (13/42)</gadget>
<output>9/14 = around 0.642857</output>

<result>9/14 = around 0.642857</result>