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进入初中,引入负数后,数的范围扩大了,带来了一系列的变化,如果仍以小学中的一些观点看待问题,就难免不出错误。所以在引入负数后,必须弄清楚应注意的问题。1.在小学学过的数中,0是最小的数,但引入负数后,0已不是最小的数了:它小于一切正数,大于一切负数;它既不是正数,也不是负数;它是正数与负数的分界。在实际问题中,0有自己的确定意义。例如,在表示温度时,0°C表示水开始结冰的确定温度;在表
After entering the junior middle school, the introduction of negative numbers has expanded the scope of the number and brought about a series of changes. If we still treat the issue in some of the primary schools, it will inevitably lead to errors. Therefore, the introduction of negative numbers, we must make it clear that we should pay attention to the problem. 1. In elementary school, 0 is the smallest number, but after the introduction of negative numbers, 0 is not the smallest number: it is less than all positive numbers, greater than all negative numbers; it is neither positive nor negative; it Is the positive and negative boundaries. In practical problems, 0 has its own definite meaning. For example, when representing temperature, 0 ° C indicates the definite temperature at which water begins to freeze; in the table