Mỗi thùng chứa 250kg sách vở
mỗi thùng chứa 250kg sách vở . mỗi xe ô tô chở 4 thùng sách vở . hỏi 2 xe ô tô như vậy chở mấy tấn sách vở
bài giải
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bài giải
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