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一、负数的引入是为了解决实际问题正数和负数在实际问题中表示相反意义的量.如,今天气温是3℃,明天气温将下降5℃,则明天的气温是(3-5)℃,得-2℃,即零下2℃.又如,规定今天收入300元记作+300元,则明天支出300元记作-300元,+300与-300区别了两个相反意义的量.在现实生活中这种相反意义的量到处可见,这也为我们学习负数带来了方便.
First, the introduction of negative numbers is to solve the problem that the positive and negative numbers in practical problems represent opposite meanings in practical problems. For example, today, the temperature is 3°C, tomorrow, the temperature will drop by 5°C, and the temperature tomorrow will be (3-5)°C. , -2 °C, that is, minus 2 °C. Another example, the provisions of today’s income 300 yuan recorded as +300 yuan, 300 yuan tomorrow will be recorded as -300 yuan, +300 and -300 distinguish two opposite sense of the amount. In real life, this opposite sense is everywhere, which also brings convenience for us to learn negative numbers.