For a cuboid whose length, width, and height are 5 cm, 4 cm, and 2 cm, the area of the smallest face is equal to the area of the largest face.
一个长宽高分别为5厘米、4厘米、2厘米的长方体，最小面的面积是最大面的面积的多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">8 / 20</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>