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圓柱的側面積:3.14×20×24=1507.2(平方釐米) 介面處的面積:2×24=48(平方釐米) 底面積:3.14×(20÷2)²;=314(平方釐米) 做著個水桶這少要:1507.2+48+314=1869.2(平方釐米)
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