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2 năm trước
cho parabol (P) : y = 2$x^{2}$ và đường thẳng (d) : y = -x +6 biết (d) cắt P tại hai điểm phân biệt A(x1,y1);B(x2,y2) với x1 < x2 tính 4x2 + y1
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