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Cut a 4-meter-long log into three small columns and increase its surface area by 8 square decimeters______ Cubic decimeter
The area of the bottom surface of four cylinders is increased after the average section is three, so the area of the bottom of the cylinder is: 8 △ 4 = 2 (square decimeter), 4 M = 40 decimeter. From v = sh, we can get: 2 × 40 = 80 (cubic decimeter). Answer: the original volume of this wood is 80 cubic decimeter. So the answer is: 80
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