一、教材分析教学目标:(1)学生能用分式表示现实情境中的数量关系,从而体现分式的模型思想,进一步发展学生的符号感。(2)学生了解分式的概念,明确分式与整式的区别,掌握简单的分式计算。(3)在土地沙化的问题中,让学生认识到保护人类生存环境的重要性。教学的重点与难点:分式的 First, the textbook analysis Teaching objectives: (1) students can use fractional representation of the relationship between the number of real situations, so as to reflect the fractal model to further develop the sense of symbolic students. (2) students understand the concept of fractional, clear the difference between fractional and integral, grasp the simple fractional calculation. (3) In the issue of land desertification, make students recognize the importance of protecting humankind's living environment. Teaching focus and difficulty: fractional