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一、搞好专项训练,为布列方程作好准备简易方程是由含有和不含有未知数的两个代数式组成的,所以用字母表示数是列方程的基础。为使学生习惯把未知数x当作已知数参加列式,善于用含有字母的式子表示数量关系,要搞好专项训练,为正确地布列方程作好准备。 1.分析题中有哪几个数量,把它们建立起一一对应的关系,以训练学生思维的条理性。如买“3支钢笔和5支圆珠笔,已知圆珠笔单价是x元,钢笔的单价是1.20元。”把其中的数量分类整理后填在下表中:
First, to do a good job of training to prepare for the Brent equation The simple equation is composed of two algebraic equations with and without unknowns, so the number of letters is the basis for column equations. In order for students to get used to the unknowns x as a known number in the formula, be good at using the letters containing the number of relations, we must do a good job in training for the correct arrangement of equations to prepare. 1. Analysis of the questions which number, to establish a one-to-one correspondence between them, to train students to think of the rational. Such as buying “3 pens and 5 ball-point pens, known ball-point pen price is x yuan, the pen's unit price is 1.20 yuan.” The number of the classification after finishing fill in the table below: