câu 1: biết 10l cát có khối lượng là 15kg a)tính thể tích của 1 tấn cát b)tính trọng lượng của 1 đống cát 3 mét khối câu 2;một quyển vở có khối lượng 80g thì có trọng lượng bằng bao nhiêu niutơn câu 3 :một khối sắt có thể tích 40dm khối.,tính khối lượng và trọng lượng của 1 khối sắt

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