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思路:假設設底面半徑是r釐米,那麼,側面積是:2×3.14×r×h=942,即3.14×r×h=942÷2①,體積是:3.14×r×r×h=2355②;用②除以①得:r=2355÷(942÷2)=5(釐米) 2355÷(942÷2)=5(釐米)
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