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底面半徑=12.56÷3.14÷2=2(分米) 底面積=2²;×3.14=12.56(分米²;) 圓柱體積=12.56×6=75.36(分米³;) 圓錐體積=12.56×6÷3=25.12(分米³;) 應消去木料:75.36-25.12=50.24(分米³;)
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