反之满足这一条件的点所构成的二阶曲线一定是椭圆。
On the other hand, the curve of second order composed with those points accord with above-mentioned factor is sure to an ellipse.
反之满足这一条件的点所构成的二阶曲线一定是椭圆。
On the other hand, the curve of second order composed with those points accord with above-mentioned factor is sure to an ellipse.
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