Take a glass of milk, drink (1/4) and fill it up with water and stir well. At this time, the pure milk in the glass accounts for ((())/(())) of the original glass of milk.
一杯牛奶，喝去(1/4)后加满水搅匀，这时杯中的纯牛奶占原来这杯牛奶的((())/(()))．
<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">(3/4) / 1</gadget>
<output>3/4 = around 0.75</output>

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