1.观察图,分别把正方形的周长与边长,面积与边长的变化情 况填入表格中。请根据你的观察,把数据填在表中。
2.填完表以后思考:正方形的周长与边长,面积与边长的变化是否有关系?它们的变化分 别有怎样的规律?规律相同吗?
说说从数据中发现了什么?
3.小结:正方形的周长和面积都随边长的增加而增加,在变化过程中,正方形的周长与边长的比值一定都是4。正方形的面积与边长的比是是一个不确定的值。
(二)情境二
1.一种汽车行驶的速度为90千米/小时。汽车行驶的时间和路程如下:
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3.从表中你发现了什么规律?
说说你发现的规律:路程与时间的比值(速度)相同。
(三)小结
一种量变化,另一种量也随着变化,并且它们的比值(也就是商)一定,我们就说两个量正比例。
(四)想一想
1.正方形的周 长与边长成正比例吗?面积与边长呢?为什么?