六年级数学下册4《比例》1比例的意义和基本性质(解比例练习课)课件新人教版.ppt

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解比例 练习课,复习:,解比例的方法:根据比例的基本性质,把比例式转化为乘积相等的等式,再根据以前学过的解方程的方法求解。,小结:,早上9点钟时,木棒的高度与它的影子的长度比是5:4,如果这时测得学校旗杆的影长为11米,那么学校旗杆的实际高度是多少米?,5cm,4cm,根据 木棒高度:木棒影子长度 = 旗杆高度:旗杆影子长度,解:设学校旗杆的实际高度是x米。,答:学校旗杆的实际高度是15米。,轿车模型长度:轿车实际长度 = 1:24,1:24是什么意思?,模型长度:实物长度,公共汽车模型长度:公共汽车实际长度 = 1:24,轿车模型长度:轿车实际长度 = 1:24,( ) : ( ) = 1 : 24,24.92,x,公共汽车模型长度:公共汽车实际长度 = 1:24,( ) : ( ) = 1 : 24,11.76,x,模型高度:实际高度 = 1:10,( ) : ( ) = 1 : 10,19.6,x,实际高度:模型高度 = 500:1,( ) : ( ) = 500 : 1,35,x,千帆竞发,帆帆顺风; 万树争春,树树参天。,

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