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nductue123
2 năm trước
a, Vẽ đồ thị hàm số $y=\frac{-1}{2}$ $x^{2}$ b, Gọi C là điểm tùy ý trên parabol, K là trung điểm OC. Khi C di chuyển trên parabol thì K di chuyển trên đường nào?
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