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phamhuuchanquoc151525329
2 năm trước
Bài 1: Quãng đường từ A đến B dài 180 km. Một ô tô đi từ A đến B hết 3 giờ. Cùng lúc đó một xe máy đi từ B về A với vận tốc bằng 1/2 vận tốc của ô tô. Hỏi kể từ lúc bắt đầu đi, sau mấy giờ hai xe gặp nhau? Bài 2: Một hình lập phương có tổng diện tích xung quanh và diện tích toàn phần là 490 cm2. Hỏi thế tích của hình lập phương đó là bao nhiêu?
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