After a 1.5-meter-long cylindrical steel is cut into three sections, the surface area increases by 9.6 square decimeters. What is the original volume of this steel?

1.5 m = 15 decimeters, 9.6 △ 4 = 2.4 (square decimeters), 2.4 × 15 = 36 (cubic decimeters); a: the original volume of this steel is 36 cubic decimeters

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