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mycao638
1 năm trước
1 bể 🐟 dạng hhcn có cd 4m,cr 3,5m,cc 3m.Trog bể ngta quét xi măng mặt đáy và 4 mặt xq,1m2 hết 1,5’.Hỏi phải mất bnhieu t/g để quét xi măng xong cái bể đó ?
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