A cuboid with a length of 2 meters has a square bottom surface. After sawing the wood into two sections parallel to the bottom surface, the surface area increases by 1.8 square decimeters. Find the volume of the original wood?
一根长2米的长方体木料底面是正方形，平行与底面将木料锯成2段后，表面积增加1.8平方分米，求原木料的体积？
<gadget id="calculator">1.8 / 2</gadget>
<output>0.9</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">0.9 * 20</gadget>
<output>18</output>

<result>18</result>