After sawing a 4-meter-long cylindrical wood into three cylindrical woods, the sum of the surface areas of the three cylindrical woods is 8 square decimeters more than the surface area of the original cylindrical wood, what is the volume of the original cylindrical wood cubic decimeter.
把一根4米长的圆柱体木料锯成3段圆柱体木料后，这三段圆柱体木料的表面积的和比原来圆柱体木料的表面积多8平方分米，原来圆柱体木料的体积是多少立方分米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 4 * 10</gadget>
<output>80</output>

<result>80</result>