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nguyenthithaihoa6
2 năm trước
Bài 3: An đi từ nhà đến trường với vận tốc 15km/h hết 1/ 6 giờ. a) Tính quãng đường An đi từ nhà đến trường. b) Khi về ( cũng trên quãng đường đó), An đi với vận tốc 10km/h. Hỏi khi về An mất bao nhiêu phút?
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