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Nguyễn Việt Anh
Giới thiệu về bản thân
hê lô bạn\n
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2024-05-12 09:48:55
we should practice everyday for the show
2024-05-12 09:44:30
độ dài quãng đường | vận tốc ( km/h) | thời gian | |
đi từ A - B | x | 12 | x/12 |
về từ B - A | x | 10 | x/10 |
=> ta có pt x/12 + x/10 = 7h6p - 6h =1h6p=1.1h
x/12 + x/10 = 1.1
10x/120 + 12x/120 = 132/120
=> 10x + 12x = 132
22x = 132
x = 132/22 = 6
=> độ dài quãng đường AB là 6 km