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一、目的要求在学习分数的基础上,理解并掌握小数的概念和性质;掌握小数四则运算的法则,并能熟练地进行小数的四则运算;掌握小数与分数互化的规律,并能熟练地进行小数与分数的互化,熟练地进行分数、小数的四则混合运算;能正确、迅速地进行近似数的计算和近似数的四则混合运算(包括预定结果精确度的计算)。二、如何掌握重点,理解难点 1.小数的概念是本章的一个重点。关于小数的概念,实际上有两种定义的方法,一种是根据记数的十进位制位值原则,从个位开始向右依次定为十分位、百分位…(个位与十分位之间用小圆点隔开),用这种形式表示的数叫小
First, the purpose of the requirements of learning scores based on the understanding and grasp the concept and nature of decimals; master the rules of the four decimal places and can skillfully carry out the arithmetic of the decimals; master the law of decimals and scores of each other and skillfully Carry out the interdependencies between decimals and scores, and skillfully perform the four-blending operation of scores and decimals. The four-hybrid operation (including the calculation of the accuracy of the predetermined result) can be performed correctly and rapidly for the approximation and the approximation. Second, how to grasp the key to understand the difficulties 1. The concept of decimals is a focus of this chapter. On the concept of decimals, there are actually two kinds of definitions of methods, one is based on the decimal decimal digit value principle, from the beginning to the right of the first ten deciles, percentile ... (one and ten bit Separated by small dots), the number in this form is called small