英语翻译How many 3-digit positive integers are odd and do not co

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/17 01:50:07

英语翻译
How many 3-digit positive integers are odd and do not contain the digit "5"?

问题：
有多少个三位的正整数是奇数且不包含数字5.
首先,三位数从100到999一共是900个,其中一半是奇数,一半是偶数,所以奇数是450个.
这其中百位是5的占了1/9,一共是50个,去掉之后剩400个.
余下的数中十位是5的占了1/10,一共是40个,去掉之后剩360个.
再余下的数中个位是5的占了1/5,一共是72个,去掉之后剩288个.
所以满足题意的这样的三位数一共288个.
There're 288 3-digit positive integers.
再问：楼下说的那种方法对么？
再答：也可以，都是一样的。：）不同的方法，殊途同归。

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