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【案例背景】苏科版数学七年级下册第十章二元一次方程,教学目标是通过分析实际问题中的数量关系的过程,进一步体会方程是刻画现实世界的有效数学模型;了解二元一次方程的概念,并会判断一组数是否是二元一次方程的解。本节要让学生通过探究与练习来了解二元一次方程,体会增设未知元的优越性,理解二元一次方程的解和二元一次方程组的解的概念,会检验一组数是否是方程、方程组的解,从而达到能够通过设两个未知数将实际问题转化为二元一次方程组来解决的目的。教师通过复习一元一次方程及其解
【Case Background】 Su Ke version of the seventh grade of mathematics, the tenth chapter of the binary equation, the teaching objective is to analyze the relationship between the actual number of the problem of the process to further understand the equation is an effective description of the real world mathematical model; The concept of equations, and will determine whether a set of numbers is a binary equation solution. This section is to enable students to understand the binary equation by exploring and practicing, to understand the advantages of adding unknown elements, to understand the concept of the solution of the binary equation and the solution of the system of binary linear equations, will test whether a set of numbers is equation , The solution of the system of equations, so as to achieve the purpose of solving the problem by converting the actual problem into a system of linear equations by setting two unknowns. The teacher passes the unary equation and its solution