Saw a piece of (1/2) meter long wood into 4 sections on average, use one of them, use ((())/(())) of this wood, use ((()) /(())) meters, how much is left.
将一根(1/2)米长的木料平均锯成4段，用去其中的一份，用去这根木料的((())/(()))，用去((())/(()))米，还剩多少．
<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>

<result>3/4 = around 0.75</result>