Cut a cylindrical piece of wood with a length of 3 decimeters into 3 small cylinders. The sum of the surface areas of the 3 small cylinders increases by 1.2 decimeters. What is the original volume of this piece of wood?
把一根长3分米的圆柱形木料截成3段小圆柱，3个小圆柱的表面积之和比原来增加了1.2平方分米，原来这根木料的体积是多少立方分米．
<gadget id="calculator">1.2 / 4</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 * 3</gadget>
<output>0.9</output>

<result>0.9</result>