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新“数”关——引入负数负数的出现,使同学们耳目一新,弄清负数的来源和意义是学好七年级数学的起点.在小学数学里,自然数、分数的引入,同学们很好理解,容易接受.而负数是怎样得来的呢?课本给出了很好的理解材料.同学们想一想,我们怎样用数学符号去记录“零上5℃”和“零下5℃”的温度呢?怎样记录“高于海平面8848米”和“低于海平面155米”的海拔高度
The new “number” pass—the introduction of a negative number of negative numbers—makes students fresh and new, and that the source and meaning of negative numbers is a good starting point for learning seventh-grade mathematics. In elementary school mathematics, the introduction of natural numbers and scores is well understood by the students. It is easy to accept. And how does a negative number come from? The textbook gives a good understanding of the material. Students think about how we use mathematical notation to record the temperatures of “5°C above zero” and “5°C below minus 5°C”. How to record altitude above sea level 8848 meters and below sea level 155 meters