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1.从算术模型到方程模型从算式到方程是小学与中学内容上的衔接点,方法上的分水岭,是从算术模型到方程模型的首次尝试跨越,对后续学习有着重要的意义。从算式到方程是列方程解决实际问题的一节预备课,通过两种方法的比较,让学生体会到用列方程解应用题的优越性。从而激发学生用列方程解决实际问题的热情。出示题目:“甲、乙两地相距220千米,汽车以每小时40千米的速度从甲地驶向乙地,3小时后,汽车改用每小时50千米的速度行驶,汽车从甲地到乙地共需多少小时?”先叫学生用算术方法给出解答,学生的主要方法有:
1. From Arithmetic Models to Equation Models From equations to equations, which are convergence points and methodological watersheds between elementary and secondary contents, they span the first attempt from an arithmetic model to an equation model and are of great importance to follow-up learning. From the formula to the equation is a preparatory course for the column equations to solve practical problems, through the comparison of the two methods, to enable students to understand the superiority of solving equations with column equations. Thus stimulating students to use column equations to solve practical problems enthusiasm. Presenting the title: “A and B are 220 kilometers apart. The car is traveling from A to B at a speed of 40 kilometers per hour. After 3 hours, the car is traveling at a speed of 50 kilometers an hour. How long does it take to get from site A to site B? ”" Ask students to arithmetically give answers. The main methods for students are: