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表面積新增了2個長是圓柱底面直徑,寬是圓柱高的長方形的面積 每個長方形的面積是 112÷2=56(平方釐米) 圓柱的高是 56÷8=7(釐米) 圓柱的體積是 (8÷2)×(8÷2)×3.14×7=351.68(立方釐米)
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