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∵煙囪冒的底面直徑是80cm,∴底面圓周長為:80πcm,∴一個煙囪帽的面積為12×80π×50=2000πcm2.製作100個這樣的煙囪帽需要鐵皮:200000πcm2=20πm2.故答案為:20π.
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