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trathanhdang6969
2 năm trước
Một người đi xe máy từ A đến B với vận tốc 30 km/h. Lúc về người đó đi với vận tốc 40 km/h. Gọi quãng đường AB là x (km). Hãy viết biểu thức vói biến x biểu thị: a) Thời gian đi từ A đến B. b) Thời gian về.
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