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求直线斜率的取值范围是平面解析几何考查的重点内容之一,解决这类问题的关键是要根据已知条件建立关于斜率的不等式,可以从以下几方面思考解决问题,寻找解题的切入点.一、利用直线与二次曲线相交
The range of calculating the slope of a straight line is one of the key contents of plane analytic geometry examination. The key to solve this kind of problem is to establish the inequality about the slope according to the known conditions, and can solve the problem from the following aspects and find the solution to the problem First, the use of straight line and the intersection of quadratic curve