1教学任务分析(1)掌握程序框图的概念;了解常用程序框图符号(输入输出框、处理框、判断框、起止框、流程线等)的意义;(2)掌握顺序结构、条件结构,能正确画出程序框图;(3)在学习用程序框图描述算法的过程中,使学生学会逻辑地、创造性地思考,学会使用数学语言表达与交流.善于认识和解决问题。2教学重点与难点教学重点:程序框图的图形符号、算法的基本逻 1 teaching task analysis (1) grasp the concept of block diagram; understanding of the commonly used block diagram symbols (input and output boxes, processing box, judgment box, starting and ending frames, flow lines, etc.); (2) master the order structure, Correctly draw the block diagram; (3) in the process of learning to use the block diagram to describe the algorithm, make students learn logical and creative thinking, learn to use mathematical language to express and exchange, good at understanding and solving problems. 2 teaching focus and difficult teaching focus: the block diagram of the graphical symbols, the basic logic of the algorithm