片段一:强化一个数是另一个数的几分之几的认识,为用百分数表示比的意义做好知识铺垫师:我们都知道姚明曾是我们国家最优秀的篮球运动员之一,在世界上也非常有名。姚明虽然非常出色,但是一个篮球队要想取得好成绩,只靠一个人的力量是不行的,国家队除了姚明之外,还有很多优秀队员,你还知道哪些篮球运动员?师:这儿就有国家队一次训练时四位队员练习投篮的情况,大家观察一下,你想知道什么? Fragment one: to strengthen a number is another part of the number of a few understanding of the significance of the ratio for the proportion of knowledge to pave the way: we all know that Yao Ming was one of our country’s best basketball player in the world Also very famous. Although Yao Ming is very good, but a basketball team in order to achieve good results, alone, one of the power is not enough, the national team in addition to Yao Ming, there are many excellent players, you know what basketball players? Teacher: There are When the national team a training four players practice shooting situation, we observe what you want to know?