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mailuong048
2 năm trước
Từ nhà đến trường xa 5km.Một ọc sinh khởi hành từ nhà lúc 6h30 dự định đến trường lúc 7h a) Tính vận tốc trung bình của em học sinh trên đường đến trường b) sau khi đi được nữa đoạn đường theo vị trí dự định ,do se hư phải dừng lại sửa mất 5 phút. Để đến trường kịp lúc học sinh trên phải đi với vận tốc trung bình bao nhiêu trên đoạn đường còn lại?
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