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一根圓鋼1.2米,鋸成0.6米的2段,表面積加12.56平方米,求圓鋼體積 鋸成2段,新增了2個橫截面面積? 圓鋼的橫截面面積是 12.56÷2=6.28平方米 圓鋼的體積是 6.28×1.2=7.536立方米
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