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省初中青年数学教师评优课比赛的课题是“圆周角定理”.这节课的教学重点是探索并论证圆周角定理,其中论证圆周角定理是教学难点.如何引导学生有效的突破难点构成了本次比赛一道亮丽的风景线.笔者全程参与了听课,本文选择三个教学片断进行回顾与评析,一起来探讨数学教学中科学有效的难点突破.
Provincial junior high school mathematics teacher evaluation course competition topic is “The angle of the circumference theorem ” .This lesson focuses on exploring and arguing the circumference angle theorem, which proves the circumference angle theorem is the teaching difficult.How to guide students to effectively break through the difficulties Constitute a beautiful scenery of this competition.I full participation in the lectures, this article selects three pieces of teaching review and evaluation, together to explore the mathematical teaching of scientific and effective breakthrough difficult.