A 2m long cuboid wood is cut into two sections along the cross section, the surface area increases by 0.4㎡, what is the original volume of the cuboid wood in m**3.
一根长2m的长方体木材，沿横截面锯成两段后，表面积增加0.4㎡，原来这根长方体木材的体积是多少m**3．
<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 * 2</gadget>
<output>0.4</output>

<result>0.4</result>