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“二元一次方程”为苏科版七年级教学内容,在备课过程中,笔者针对几个环节进行了两次设计,课堂教学产生了不同的效果.一、第一次教学设计1.问题设计环节1:创设情境,引入新课.1.根据篮球比赛规则:赢一场得两分,输一场得一分.在某次中学生篮球联赛中,一支球队赛了若干场后积20分,该队赢了几场?输了几场?2.某位集邮爱好者买了面值是50分的邮票和面值是80分的邮票若干枚,花了6.3元.那么他买了两种邮票各多少枚?环节2:合作交流,探索新知.思考:方程2x+y=20和2x+3y=25有哪些共同特点?
“Binary equation ” for the Suke version of the seventh grade teaching content, in the preparation process, the author for several aspects of the two designs, classroom teaching has had different effects. First, the first teaching design 1. Problem Design 1: Create a situation, the introduction of a new lesson .1. According to the rules of the basketball game: win a score of two points, lost a point in a high school basketball league, a team a number of games after the game A total of 20 points, the team won a few games? Lost a few games? 2. A philatelic enthusiast bought a stamp of 50 cents and a denomination of 80 cents stamps, spent 6.3 yuan. Then he bought What are the two stamps? Link 2: Cooperation and exchange, explore new knowledge. Thinking: What are the common characteristics of the equation 2x + y = 20 and 2x + 3y = 25?