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nguyenthiphuongthvp
2 năm trước
Bài 1: Một ô tô và một xe máy cùng xuất phát lúc 8 giờ 15 phút để đi từ A đến B. Vận tốc của xe máy bằng 3/4 vận tốc của ô tô. Hỏi xe máy đến B lúc mấy giờ, biết quãng đường AB dài 210km và ô tô đến B lúc 10 giờ 20 phút Bài 2: Một nền nhà hình chữ nhật có chu vi bằng 48m. Chiều dài hơn chiều rộng 8m a, Tính diện tích nền nhà b, Người ta dùng các viên gạch hình vuông có cạnh 2,5dm để lát nền. Tính số viên gạch cần dùng Ai giúp e vs ạ!!!
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