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变式是一种重要的思想方法,也是一种重要的学习途径.从“变”的表象中抓住“不变”的规律,从“不变”的规律中,寻求创新的平台,能锻炼自己的思维品质,提高学习的效率.例1小丽说:“一个有理数,如果不是正有理数,必定就是负有理数.”你认为她说得对吗?为什么?分析:这里提出的问题主要是针对有理数的分类而言的.有理数包含整数和分数.根据正负性,有理数可以分成正有理数、0、负有
Variant is an important way of thinking as well as an important way of learning. It seizes the law of “immutable” from the appearance of “change ” and seeks from the law of “immutable ” Innovative platform to exercise their own thinking quality and improve learning efficiency Example 1 Mary said: “A rational number, if not positive rational number must be negative rational number.” Do you think she is right? Why? Analysis : The questions raised here are mainly for the classification of rational numbers. Rational numbers contain integers and fractions. According to the positive and negative, rational numbers can be divided into positive rational numbers 0, negative