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在教学一般几何初步知识时,很有必要对学生进行“整体结构”训练。进行这种训练一方面可使学生能熟练地运用所学的知识,解决有关的实际问题;另一方面通过整体结构训练,培养学生的辩证唯物主义观点,发展学生的逻辑思维能力。教学时,可考虑分别进行如下几组训练: (一)长(正)方形的周长的整体结构训练公式:(长+宽)×2(?)周长例题:①一个长方形的长是16厘米,宽是(?)厘米,周长是多少厘米? [已知长和宽,求周长:(16+5)×2] 辨析:(长+宽)得到长和宽的和,乘以2,得到周长。②一块长方形地的周长是90
When teaching general geometric initial knowledge, it is necessary to train students in the “whole structure”. On the one hand, such training can enable students to skillfully use the knowledge they have learned to solve practical problems; on the other hand, through the training of overall structure, develop students' dialectical materialism and develop their logical thinking ability. Teaching, you can consider the following groups of training were as follows: (a) (positive) the perimeter of the overall structure of the square training formula: (length + width) × 2 (?) Perimeter Example: ① a rectangular length is 16 (Known as length and width, seeking circumference: (16 + 5) × 2] Analysis: (length + width) to get the sum of length and width, multiplied by the number of 2, get the circumference. ② a rectangle to the circumference of 90