There is a kind of aquatic plants that doubles in size every day. By the 6th day, the aquatic plants have covered the entire pool, and on the 4th day, the aquatic plants have covered the entire pool ((())/(())).
有一种水草，每天增长1倍，到第6天，这些水草就长满了整个水池，第4天时，水草长满了全池的((())/(()))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>