tuanhotboy
20/12/2018 at 12:43-
Nguyễn Mạnh Hùng 09/01/2019 at 12:34This is a problem in the newspaper:"Toán học tuổi thơ" that you must be solve it yourself, shouldn't give it to here!!
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FacuFeri 18/01/2019 at 10:03
You can ask your teacher
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Nguyễn Minh Đức 20/12/2018 at 14:43
i don't understand :(((