A cuboid 8 decimeters long is sawn into two pieces along the direction parallel to the bottom. The total surface area of the two pieces of wood is 1 square decimeter larger than the original. Find the volume of the original cuboid.
有一根8分米长的长方体木料，沿与底面平行的方向锯成两段，这两根木料总的表面积比原来多1平方分米．求原来这根长方体木料的体积．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 8</gadget>
<output>4</output>

<result>4</result>