求重量是多少，怎么算，结果请写上，谢谢了。在线等。

200mm X 300mm X 6mm X 5600mm 1根253.12KG 45.2kg/m

200mm X 300mm X 6mm X 8000mm 1根361.6KG

200mm X 100mm X 4mm X 5400mm 5根486.378kg 18.014kg/m

80mm X 60mm X 3mm X 8000mm 1根49.032kg 6.129kg/m

200mm X 200mm X 6mm X 5700 1根204.06kg 35.8kg/m

200mm X 200mm X 6mm X 11500mm 1根411.7kg

200mm X 200mm X 6mm X 5700mm 2根408.12kg

200mm X 200mm X 6mm X 11500mm 1根411.7kg

160mm X 80mm X 4mm X 5800mm 4根329.8112kg 14.216kg/m

80mm X 80mm X 4mm X 11500mm 2根106.053kg 9.222kg/m