解数学题.The year 2040 is a very unique four-digit year because
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解数学题.
The year 2040 is a very unique four-digit year because it has two zero digits and the other two digits are different, even, nonzero digits. How many different four-digit years greater than 2000 exist with this special trait (two zero digits while the other two digits are different, even, nonzero digits)?
2040年是一个特别的年数,他有2个0和另外两个不同且非零的偶数.
在大于2000的四位数中,有多少个这样的数字.
(两个0,另外两个不同且非零的偶数.)
请列出解答步骤
The year 2040 is a very unique four-digit year because it has two zero digits and the other two digits are different, even, nonzero digits. How many different four-digit years greater than 2000 exist with this special trait (two zero digits while the other two digits are different, even, nonzero digits)?
2040年是一个特别的年数,他有2个0和另外两个不同且非零的偶数.
在大于2000的四位数中,有多少个这样的数字.
(两个0,另外两个不同且非零的偶数.)
请列出解答步骤
以首位数为2的举例
1)第2位为偶数的四位数:2400,2600,2800
2)第2位为0的四位数:2004,2006,2008,2040,2060,2080
一共9个,以此类推,首位数为4,6,8的四位数也有9个
所以一共有4X9=36个
1)第2位为偶数的四位数:2400,2600,2800
2)第2位为0的四位数:2004,2006,2008,2040,2060,2080
一共9个,以此类推,首位数为4,6,8的四位数也有9个
所以一共有4X9=36个
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