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“平方根”是苏科版八年级上册“实数”第一节的内容,尽管在七年级上册已经安排了“有理数与无理数”的学习,但是,它只是从数的认识上让学生直观感受无理数的存在,没有进行系统的学习与研究,再加上一年时间的间隔,因此从学生预习的情况来看,他们对无理数似乎没有形成必要的概念,更没有纳入自己的知识体系.基于这种情况,执教老师根据学生的实际情况与学习诉求,决定从探索2~(1/2)开始.
“Square root ” is Su Ke version eighth grade “real number ” the first section, although in the seventh grade has been arranged for “rational and irrational number ” learning, but it is only from the number of understanding Let students intuitively feel the existence of irrational numbers, without systematic study and research, plus the interval of one year, so from the perspective of students’ preview, they seem to have not formed the necessary concepts for irrational numbers, nor have they included their own knowledge Based on this situation, the coaching teacher decided to explore 2 ~ (1/2) according to the students’ actual conditions and learning demands.