A piece of cloth is 3 meters long, (1/3) is used to make trousers, (1/2) is used to make a jacket, how much of this piece of cloth is left.
一块布长3米，做裤子用去(1/3)，做上衣用去(1/2)，还剩这块布的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (1/2)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

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