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2 năm trước
Cho biết x và y là 2 đại lượng tỉ lệ nghịch khi x= 7 , thì y = 10 a) tìm hệ số. Tỉ lệ nghịch y đối với x b) hãy biểu diễn y theo x c) tính giá trị của y khi x=5, khi x=14
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