数学题:财务室会计结账时,发现账面上少了890.1元钱
- 时间:2020-06-07 17:57:17
- 分类:数学世界
- 阅读:143 次
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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