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片段一:创设情景,抓住概念的切入点师:同学们,你见过中国地图吗?用手比划一下你见过的中国地图有多大?生:这么大,这么大……(学生比划的大小不一)师:那画在地图上的中国版图都是什么形状?生:雄鸡!(学生异口同声高喊)师:中国地图大小不一,但形状相同,唉,同学们你想过没有,设计师是怎么把960万平方千米的中国画在不同的图纸上,而形状又不变的呢?生:是按照一定的比缩小的。(学生纷纷回答)
Fragment one: the creation of scenarios, to seize the starting point of the concept division: classmates, have you ever seen a map of China? Gestured by gestures of how many Chinese maps you have seen? Students: so big, so big ... Different sizes) Teacher: That painted on the map of China are what shape? Health: rooster! (Students shouting with unanimous) Teacher: China map of different sizes, but the same shape, alas, classmates, you thought no How does a designer paint 9.6 million square kilometers of Chinese painting on different drawings without change in shape? Health: It is reduced according to a certain ratio. (Students have answered)