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Created September 23, 2015 04:07
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Question 2
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Answer.txt
Dùng "+" thì mỗi lần create một object mới chõ mỗi lần dùng, còn "concast" làm việc với chính nó nên việc sử dụng "+"
sẽ cho tóc độ xử lí chậm hơn.
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