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hoangcam10082002
2 năm trước
Một xe máy đi từ A với vận tốc 40km/giồ.Một giờ rưỡi sau một ô tô con cũng đi từ A với vận tốc 60km/ giờ và cùng chiều với xe máy .Hai xe đến B cùng 1 lúc .Độ dài quãng đường AB là A.90km B.120km C.180km D.150km
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