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第一章有理数1.1正数和负数同学们在小学已经学习了整数,分数(包括小数),即正有理数及0的知识,对负数的意义也有初步的了解,也会用负数表示日常生活中的一些量,这为我们将学习本章内容打下良好的基础.但这些知识对负数意义的了解非常有限,在一些比较复杂的实际问题中,我们需要针对问题的具体特点规定正,负,特别是要用正数与负数描述向指定方向变化
Chapter 1 Rational Numbers 1.1 Positive Numbers and Negative Numbers Students have learned integers, fractions (including decimals) in primary school, that is, knowledge of positive numbers and zeroes. They also have an initial understanding of the meaning of negative numbers, and they also show negative numbers in daily life Some quantities, which lay a good foundation for us to study the contents of this chapter.But these knowledge have very limited understanding of the meaning of the negative number, and in some more complicated practical problems, we need to stipulate positive and negative according to the specific characteristics of the problem, especially Use positive and negative numbers to describe changes in the specified direction