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nguyentrinhkt02
2 năm trước
trong mặt phẳng tọa độ oxy cho parabol (p) y=x^2 và hai đường thẳng (d): y = m ; (d'): y = m^2 ( với 0<m<1) . Đường thẳng (d) cắt (P) tại hai điểm phân biệt A, B ; đường thẳng (d') cắt (P) tại hai điểm phân biệt C, D ( với hoành độ A và D là số âm) . Tìm m để diện tích tứ giác ABCD gấp 9 lần diện tích tam giác OCD
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