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平均截成3段後就新增了4個圓柱底面的面積,所以圓柱的底面積為:8÷4=2(平方分米),4米=40分米,由V=Sh可得:2×40=80(立方分米),答:原來這根木料的體積是80立方分米.故答案為:80.
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