How many 3-digit numbers have exactly one digit 5 in them
How many 3-digit numbers have exactly one digit 5 in them
4月22日11点之前解答,谢谢了!(解释并写出答案)
4月22日11点之前解答,谢谢了!(解释并写出答案)
数学人气:185 ℃时间:2020-02-06 01:30:18
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在所有的三位数中,其中有且只有一位是5的有多少个?假设5在百位,即:5 _ _ ,剩下的两个位置可以填入0到9(除了5)的任何数,所以他们的组合有9×9=81个;若5在十位,即:_ 5 _ ,则百位除5不能填以外,0也不能填,因为要...
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