Toán Lớp 4: Khoi lop 4 va khoi lop 5 co tat ca 248 hoc sinh. So hoc sinh khoi lop 5 it hon khoi hoc sinh lop 4 la 18 hoc sinh. Hoi moi khoi co bao nhieu hoc sinh?
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Toán Lớp 4: Khoi lop 4 va khoi lop 5 co tat ca 248 hoc sinh. So hoc sinh khoi lop 5 it hon khoi hoc sinh lop 4 la 18 hoc sinh. Hoi moi khoi co bao nhieu hoc sinh?
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