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众所周知直线与圆锥曲线有且仅有一个交点,不能保证两图形相切。由于问题的复杂常使解题出现错漏,为此有必要了解这类问题的正确解答,请看一例。
It is well known that straight lines and conic curves have one and only one intersection, and it cannot be guaranteed that the two figures are tangent. Since the complexity of the problem often leads to errors or omissions in the solution, it is necessary to understand the correct answer to this type of problem. Please see an example.