Bài 1: Theo em tại sao các tấm tôn lợp nhà lại có dạng lượn sóng mà không làm tôn phẳng? Bài 2: Một lọ thủy tinh được đậy kín bằng nút thủy tinh. Khi nút bị kẹt, theo em có thể làm như thế nào để lấy được nút ra một cách dễ dàng mà không làm hỏng đồ vật?

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