“比的实际应用——按比例分配的简单实际问题”中有一道例题:给30个方格分别涂上红色和黄色,使红色和黄色方格数的比是3∶2。两种颜色各应涂多少格?学生给出了两种方法。方法一:3+2=5,30÷5×3=18(格)……红色,30÷5×2=12(格)……黄色。方法二:30×3=18(格)……红色,30×3=12(格)……黄色。3+23+2A教师认为,方法一更容易被学生理解和接受,而 One example from the “Practical Application of Ratio - Simple, Practical Problems Scaled Distribution” is to give each of 30 squares a red and a yellow color, so that the ratio of red to yellow squares is 3: 2. How many cells should each be painted in two colors? Students give two methods. Method 1: 3 + 2 = 5,30 ÷ 5 × 3 = 18 (grid) ... red, 30 ÷ 5 × 2 = 12 (grid) ... yellow. Method two: 30 × 3 = 18 (grid) ... red, 30 × 3 = 12 (grid) ... yellow. 3 + 23 + 2A Teachers believe that Method One is easier for students to understand and accept, whereas