Hope Elementary School has built a flower bed. The height measured from the outside is 0.5 meters. The bottom is a square with a side length of 12 decimeters. It is surrounded by bricks and the thickness is 0.2 meters. The school wants to fill this flower bed with soil. Woolen cloth?
希望小学建了一个花坛，从外面量高0.5米，底面是边长12分米的正方形，四周用砖砌成、厚度是0.2米，学校想用土填满这个花坛，至少需要多少立方米的土呢？
<gadget id="calculator">12 / 10</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">0.2 * 2</gadget>
<output>0.4</output>

<gadget id="calculator">(6/5) - 0.4</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 * 0.8 * 0.5</gadget>
<output>0.32</output>

<result>0.32</result>