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【经典例题】大象馆和猩猩馆相距60米。同学们要在两馆间的小路两旁栽树,相邻两棵树之间的距离是3米。一共要栽几棵树?错解1:60÷3+1=21(棵),21×2=42(棵)错解2:60÷3-1=19(棵)错解3:60÷3=20(棵)【原因分析】一、师生对话,寻求问题根源1.与错解1的学生对话:师:你为什么这样做呢?生1:大象馆和猩猩馆相距60米,每隔3米种一棵,60÷3=20(段),两端都要种,20+1=21(棵),两边都种:21×2=42(棵)师:为什么是两端都种呢?
[Classic example] Museum of elephants and orangutan Museum 60 meters apart. The students planted trees on both sides of the path between the two museums, and the distance between two adjacent trees was 3 meters. A total of planted trees? Wrong solution 1: 60 ÷ 3 +1 = 21 (tree), 21 × 2 = 42 (tree) wrong solution 2: 60 ÷ 3-1 = 19 3 = 20 (tree) [Cause Analysis] First, the dialogue between teachers and students to find the root causes of the problem 1 and the wrong solution 1 students dialogue: Teacher: Why do you do Health 1: Museum of elephants and orangutans Museum 60 meters apart, Every 3 meters a species, 60 ÷ 3 = 20 (section), both ends of the species, 20 +1 = 21 (trees), both sides of the species: 21 × 2 = 42 All kinds of it?