一、填空。1.确定小学数学教学内容的原则是:____;确定这些基础知识的具体做法是:______。2.小学数学教材中,适当渗透了____、____、____等一些现代数学思想。3.一亿八千万九千写作_______。4.用0、2、3、5、9五个数字组成一个最大的五位数是______,把它四舍五人到万位约等于______;用这五个数字组成一个最小的五位数是 First, fill in the blank. 1. The principle of determining primary school mathematics teaching content is: ____; The specific way to determine these basic knowledge is: ______. 2. Primary mathematics textbooks, appropriate infiltration of ____, ____, ____ and some other modern mathematical ideas. 3. One hundred and eighty-nine million writing _______. 4. With 0, 2, 3, 5, 9 five numbers to form a maximum of five digits is ______, put it rounded to about million equal to ______; use these five numbers to form a minimum of five The median is