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（一）复习诊测媒体出示 :把各图中标出的部分用分数表示（１）学生独立做在书上１１７页。（２）做完后指名回答 ,并提问你是怎样想的？（二）激思引新（１）媒体显示一张数学王国大门紧闭的图片。（２）师谈话 :“同学们 ,想跟老师一起去数学王国作客吗？”当学生跃跃欲试时
(A review of diagnostic media presentation: the parts marked in the figure with scores (1) the students do the book on page 117 independently. (2) After completing the name answer, and asked how do you think? (B) Inspiration cited new (1) the media shows a picture of the kingdom of mathematics closed the door. (2) teacher talk: “classmates, want to go with the teacher to the math kingdom guest?” When the students eager to try