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）

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