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nhungloga2019
2 năm trước
Một chiếc ô tô qua một cái đèo gồm hai đoạn AB và BC.Đoạn AB dài bằng 2/3 đoạn BC. Ô tô lên đoạn AB mỗi giờ đi được 30 km và xuống đoạn BC mỗi giờ đi được 60 km.Ô tô chạy từ A đến C hết 21 phút. Tìm quãng đường AB,BC? nhớ ghi cả câu trả lời nha mn
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