论文部分内容阅读
近似数和有效数字是我们学习的一个难点,请看,王老师给你支招.近似数和有效数字在我们生活中的应用十分广泛,我们知道:通过测量或估计得到的非常接近实际数值的数叫做近似数.比如,小芳的妈妈在一家超市里买了2千克香蕉.其中“2千克”中的“2”是营业员称出来的,是近似数.一个近似数从左边第一个不是0的数字起,到末位数字为止,所有的数字都叫做这个数的有效数字.
Approximate numbers and significant figures are a difficult part of our study. Please see, Mr. Wang gives you support. Approximate and significant figures are widely used in our lives. We know that the measured or estimated values are very close to the actual values. The number is called an approximate number. For example, Xiaofang’s mother bought 2 kilograms of bananas in a supermarket. Among them, the “2” in “2kg” is called by the salesperson and is an approximate number. An approximate number from the left The first number is not 0, until the last digit, all digits are called the number of valid digits.