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片段一:点击生活,初入学习新领域师:乒乓球是我国的国球,打乒乓球时用什么方法决定谁先发球比较公平?生1:抛硬币。师:能联系学过的知识!生2:裁判把球放在手里让其中一个运动员猜:球在左手还是右手?师:用这方法决定谁先发球,公平吗?生:公平。师:为什么呢?生3:乒乓球可能在左手也可能在右手,猜对的可能性是一半,猜错的可能性也是一半。师:刚才说到可能性是一半,“一半”用分数怎么表示?
Fragment one: click on life, enter a new field of learning Division teacher: table tennis is our national ball, playing table tennis which way to decide who serve first more fair? Health 1: flip coins. Teacher: can contact the learned knowledge! Health 2: the referee put the ball in one hand so that one of the athletes guess: the ball in the left hand or right hand? Teacher: this method to decide who serve first, fair? Health: fair. Teacher: Why? Health 3: Table tennis may be in the left hand may also be in the right hand, the possibility of guessing is half, the possibility of guessing is half. Teacher: Just said the possibility is half, “Half ” How to use the score?