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文1讲解了椭圆的内切圆与外接圆(蒙日圆)的半径,以及求了椭圆内接菱形、外切矩形的面积范围.在认真拜读后,有两点思考:一是由椭圆基本量a,b,c生成的以原点为圆心的圆比较多,且不少都有自己特有的性质,如果我们能探究、归纳,再遇到这类问题时可以迅速认清问题的本质,且可以将条件、结论适当组合或特殊化而命制一些题目;二是作者认为文中两个问题的求解经典,巧妙的变形及换元,有效地避免了求导带来的巨
Text 1 explains the radius of the inscribed circle and circumcircle (Mongolian yen) of the ellipse, as well as the area range of the rhombus and circumscribed rectangle within the ellipse. After careful reading, there are two points of thinking: First, A, b, c generated by the origin of the center of the circle more, and many have their own unique nature, if we can explore, sum up, and then encounter such problems can quickly identify the nature of the problem, and can The conditions, the conclusion of the appropriate combination or special order and some problems; the second is that the author of the text of the two classic solutions, clever deformation and change, effectively avoiding the huge demand