(11/30)-(9/20)+(7/12)-(5/6)+(1/2).
(11/30)-(9/20)+(7/12)-(5/6)+(1/2)．
<gadget id="calculator">11 / 30</gadget>
<output>11/30 = around 0.366667</output>

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

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

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

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

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

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

<gadget id="calculator">(-1/12) + (-1/4) + (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>