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问题问题136数学选修1-1B版,在导数的实际应用中有这样一个典型例题,有一块边长为a的正方形铁板,现从铁板的四个角各截去一个相同的小正方形,做成一个长方体形的无盖容器,为使其容积最大,截下的小正方形边长应为多少?课本P105(2005年7月第1次印刷)给出的解如下:设截下的小正方
Problem 136 Mathematical elective 1-1B, there is a typical example in the practical application of the derivative, there is a square iron plate with side length a, now cut off the same small square from the four corners of the iron plate, What is the size of a small square that should be cut to make it a cuboid container without a lid? The textbook P105 (the first print in July 2005) gives the solution as follows: Square