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一、问题的背景在一次区域性数学期末测试中(人教课标版教材三年级下学期),有这样一道填空题:四个边长都是26厘米的小正方形,如果把它们拼成一个大正方形,周长是()厘米,面积是()平方厘米;如果把它们拼成一个长方形,周长是()厘米,面积是()平方厘米。测试后相关数据显示,前面三空各校学生的得分率基本为80%以上,而最后一空各校的情况差异甚大,有的学校学生得分率达到90%以上,有的则不足50%,有的甚至只有三分之一左右。部分得分率不高的学
First, the background of the problem In a regional final math test (third grade textbook for people to teach the next semester), there is a fill in the blank: four sides are 26 cm long square, if they are spelled together Large square, perimeter is () cm, the area is () cm 2; if they are put together into a rectangle, the perimeter is () cm, the area is () cm 2. After the test, the relevant data show that the scores of students in front of the three schools are basically above 80%, but the situation in the last one is quite different. Some students score more than 90% and others less than 50% Even about a third. Part of the score is not high rate of learning