9*((2/15)-(1/12))-0.2=how much.
9*((2/15)-(1/12))-0.2=多少．
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(2/15) - (1/12)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">9 * (1/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) - 0.2</gadget>
<output>0.25</output>

<result>0.25</result>