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buivanlam805
2 năm trước
Cho x và y là hai đại lượng tỉ lệ thuận với các cặp giá trị tương ứng x1,y1 và x2, y2. a, Tính x2 biết x1 = 2; y1 = 1/7 ; y2 = -0,75 b, Tính x1; y1 biết y1 - x1 = -2; x2 = - 4; y2 = 3.
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