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phuongthaonc90
2 năm trước
Thùng to có 21l nước mắm , thùng bé có 15l nước mắm. Toàn bộ số nước mắm đó được chia vào các chai như nhau, mỗi chai 0,75l. Hỏi có tất cả bao nhiêu chai nước mắm ( giải bằng hai cách ) ?
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