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圓錐地面圓的周長3.14米*4=12.56米,半徑=12.56/3.14/2=2米 1/4圓錐體積=1/4*(3.14*2*2*1.5*1/3)=1.57立方米 玉米質量=1.57*785=1232.45千克
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