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有这样一道高考题:将边长为1m正三角形薄片,沿一条平行于底边的直线剪成两块,其中一块是梯形,记S=(梯形的周长)~2/梯形的面积,则S的最小值是________。我们来好好品味与探究一下此题。一、三个特色1.源于课本,题意简明本题以较容易的、学生能理解的正三角形和梯形的周长及面积为背景,在必修5《基本不等式的应用》、切合中学数学教学的实际,难度适中,题意明确、简洁,
There is such a college entrance examination questions: the side length of 1m is a triangular sheet, along a straight line parallel to the bottom cut into two, one is a trapezoidal, remember S = (trapezoidal perimeter) ~ 2 / trapezoidal area, then The minimum value of S is ________. We come to taste and explore this question. One or three characteristics 1. From the textbooks, the subject is concise This question is easier, students can understand the equilateral triangle and trapezoid perimeter and area as the background, compulsory 5 “basic inequality of application”, in line with the teaching of high school mathematics The actual difficulty of moderate, clear meaning, concise,