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2 năm trước
Cho x và y là hai đại lượng tỉ lệ nghịch khi x1 = 2 ; x2 = 5 thì 3y1 + 4y2 = 46 . a . Hãy biểu diễn x theo y b . Tính giá trị của x khi y = 23
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