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2 năm trước
Cho biết hai đại lượng x và y tỉ lệ thuận với nhau và khi x - 5 thì y - 3. a,Hãy biểu diễn y theo x. b,Tìm hệ số tỉ lệ với x đối với y. c,Tính y khi x - (-5) ; x = 10.
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