cô giáo mua 33 quyển sách vừa văn vừa toán. giá mỗi quyển sách toán là 15000 đồng, giá mỗi quyển văn là 12000 đồng. số tiền mua sách toán nhiều hơn số tiền mua sách văn là 90000 đồng. hỏi cô đã mua bao nhiêu quyển toán, văn giúp mk với 7 giờ mk học rồi

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