数学题:财务室会计结账时，发现账面上少了890.1元钱。经核对是把小数点点错一位。原数是多少？

数学题解答：1、算术方法：

账面上钱少了，说明是把小数点向左移了一位。

小数点向左移动一位，得到的数缩小为原数的1/10。

那么少的890.1元钱，就是原数的1 – 1/10 = 9/10。

所以原数是：890.1 ÷ (1 – 1/10) = 989（元）

2、如果用方程做，还可以设现在的钱数为x元。

解：设现在的钱数为X元

10X-X=890.1

x=98.9

98.9×10=989（元）

推荐阅读：
3 Times Social Media and Cancel Culture Helped in Snuffing Out R　 How to Track Your Time as a Freelance Blogger　 US Government on Ban TikTok: Should you worry about your blog?　 Blogging Mistakes Most Beginner Bloggers Make　 Creating a Website for Your Brand: 4 Best Practices You Must Con　 What Is Content and Why Does It Matter?　 5 Things to Know When Starting a Financial Blog　 How to Improve the Marketing for Your Online Business　 Building an Online Store – What You Need to Do　 Independent Digital Media Is Being Shut Down Around the World, a