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Trong 5 phút, nhiều người lớn cũng không tìm được đáp án bài toán bán trứng dành cho học sinh lớp 5.
Đề bài : Chín chiếc túi lần lượt đựng 3, 5, 8, 15, 17, 18, 21, 27 và 36 quả trứng.
Bất kỳ ai muốn mua trứng phải mua hết số trứng trong một túi. Bác Biên và bà Bích mỗi người mua bốn túi trứng. Biết số trứng của bà Bích gấp ba lần số trứng của bác Biên. Hỏi túi trứng còn lại có bao nhiêu quả trứng?
Trần Phương
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