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尽管“植树问题”从实验教材四年级下册移至义务教育教材五年级上册,但是,在多次聆听“植树问题”的课堂教学时,仍听到不少埋怨的声音。声音一,老师心声——植树问题难教难学单从知识层面来分析,植树路线的不同,植树要求的不同,路线被分成的间隔数和植树的棵数之间的关系也就不同。就植树问题的路线而言,可以是在一条线段路线上植树,也可以是在一条封闭曲线(如圆形、正方形、长方形等)路线上植树。就线段路线而言,包括单边植树和双边植树两种情况。每一种情况又存在三种基本的植树情形,如两端都要栽,只栽一
Although the “tree planting problem” was shifted from the fourth grade of the experimental textbook to the fifth grade of the compulsory education textbook, many complaints were still heard when we listened to the classroom teaching of “tree planting problem” many times. Sound One, the teacher’s voice - tree planting Difficult to teach difficult to learn single From the knowledge level to analyze the different planting routes, planting different requirements, the route is divided into the number of intervals and the relationship between the number of tree planting is different. In the case of tree planting routes, tree planting may take place on a single route or in a closed curve (such as a circle, a square, a rectangle, etc.). In terms of the line segment, both unilateral tree planting and bilateral tree planting are included. In each case, there are three basic tree planting situations, such as planting both ends and only planting one