Khối lớp bốn có 192 học sinh chia làm các nhóm mỗi nhóm có 8 học sinh. Khối lớp 5 có 207 học sinh chia làm các nhóm, mỗi nhóm, mỗi nhóm có 9 học sinh.hỏi ca hao khối có tất cả bao nhiêu nhóm

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