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Monsieur Tuna
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Cố Tử Thần
18 tháng 3 2019 lúc 21:30

hay lắm

ok

k mik vs

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Monsieur Tuna
18 tháng 3 2019 lúc 21:31

Ai khen cho 3 tk

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ßσss™|๖ۣۜHắc-chan|
18 tháng 3 2019 lúc 22:39

hay đóooooooooooooo

k tui đi ,nhé,nhé!

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Monsieur Tuna
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Monsieur Tuna
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Monsieur Tuna
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Monsieur Tuna
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❤к-ρ๏ρ⁀ᶦᵈᵒᶫ❤
18 tháng 3 2019 lúc 21:49

Thời gian người đi từ A đã đi được trước đó là : 

   7 giờ 45 phút - 7 giờ = 45 phút = 0,75 giờ

Quãng đường người đi từ A đã đi trước đó là :

   0,75 x 40 = 30 ( km )

Quãng đường thật là :  

   142,5 - 30 = 112,5 ( km ) 

Thời gian để hai người gặp nhau là :

   9 giờ - 7 giờ 45 phút = 1giờ 15 phút = 1,25 giờ

Tổng hai vận tốc là :

   112,5 : 1,25 = 90 km/giờ

Vận tốc của người đi từ B là :

   90 - 40 = 50 km / giờ

             Đ/s : ....

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ßσss™|๖ۣۜHắc-chan|
18 tháng 3 2019 lúc 22:38

https://olm.vn/hoi-dap/detail/41407341258.html

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Phạm Hải Yến
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Nguyễn Thị Ngọc Ánh
1 tháng 3 2019 lúc 20:50

1 like, 1 share and 1 sub

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~Love shadow _ the Taylo...
3 tháng 3 2019 lúc 20:27

like 😀 😁 🤣 😍 😐

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~Love shadow _ the Taylo...
3 tháng 3 2019 lúc 20:27

;)

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Monsieur Tuna
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Nguyễn Lê Na
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Nguyễn Thị Ngọc Thơ
16 tháng 8 2018 lúc 4:35
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