Pour 5 liters of water into a cube glass container (thickness is not counted) with a side length of 2 decimeters, how many decimeters is the water surface from the container mouth.
把5升的水倒入一个棱长为2分米的正方体玻璃容器(厚度不计)中，水面离容器口多少分米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">2 - (5/4)</gadget>
<output>3/4 = around 0.75</output>

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