A rope, cut off (1/4), there is still (1/4) meter, how many meters has been cut from this rope.
一根绳子，剪去(1/4)，还剩(1/4)米，这根绳子剪去了多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(1/3) * (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<result>1/12 = around 0.083333</result>