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一、打好列方程的基础——专项训练列方程解应用题的思路与算术法的区别在于设x代表未知数后,可把它与已知数处于同等地位,按题中的数量关系,直接参加列式,列式时不需进行逆思考。所以,教学时,教师要通过多种途径把x当作已知数参加列式的多项训练。如: 1.列代数式的训练即把用语言叙述的数量关系“翻译”成含有字母的式子。如第75页例1中,设每袋饺子粉重x千克,卖出7袋,共卖多少千克?可写成
First, to lay a good foundation for column equations - special training column equation solution The idea of the problem and the arithmetic method is different from the set x unknown, you can put it with the known number in the same position, according to the number of questions in the relationship directly Participate in the column type, column type without thinking. Therefore, teaching, teachers through a variety of ways to x as a known number to participate in a number of column training. Such as: 1. Algebraic training that is the number of language to describe the relationship between the number of “translated” into a formula with letters. As in Example 1 on page 75, suppose the number of kilograms of flour per kilogram of dumpling is x kg and the number of kilos sold is 7