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圓柱形的鋼材截成相等的兩段以後,表面積新增了兩個的圓柱的底面. 底面積:0.28÷2=0.14(平方分米) 4米=40分米 圓柱的體積:0.14×40=5.6(立方分米) 重:5.6×7.8=43.68(千克)
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