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数学活动课上,相老师给同学们出了一道题目:用12.56米长的栅栏围成一块菜地,怎样围面积最大?最大的面积是多少呢?有的同学说围成长方形的面积大,还有的说围成正方形的面积大,到底谁说得对呢?相老师让同学们自己动手去算一算,验证一下。不一会儿,韩美美举手发言说:“我是通过列举比较法来解决这个问题的,12.56米是长方形的周长,则长与宽的和是12.56÷2=6.28(米)。列举如下:
Mathematics activity class, phase teacher to the students out of a topic: with a 12.56-meter-long fence surrounded by a piece of vegetable, how to enclose the largest area? What is the largest area? Some students say the area around the growth of large square, Others say the area surrounded by a large square, in the end who is right? The teacher let the students do their own calculations, verify. In a moment, Hanmei raised her hand and said: ”I solved this problem by enumerating the comparative laws. The length of 12.56 meters is the circumference of a rectangle, and the sum of length and width is 12.56 ÷ 2 = 6.28 (meters). :