giải giúp mik bài này: Một vật bằng nhôm có khối lượng 70g treo vào một đầu dưới của 1 lò xo treo thẳng đứng . Tính thể tích và trọng lượng của vật ? Biết khối lượng riêng của nhôm là 2700kg/m.

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