If a cube with side length 10 decimeters is cut into smaller cubes with side length 2.5 decimeters, what is the increase in surface area by how many square decimeters?
把一个棱长是10分米的正方体切成棱长是2.5分米的小正方体后，表面积增加了多少平方分米．
<gadget id="calculator">10 / 2.5</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">3 * 3 * 2 * 100</gadget>
<output>1_800</output>

<result>1_800</result>