How many 3 digits numbers have exactly one digit 5 in them?

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• How many 3 digits numbers have exactly one digit 5 in them?ji
• How many 3-digit numbers have only one digit 5 in them?
• How many 3-digit numbers have exactly one digit 5 in them4月22日11点之前解答,谢谢了!(解释并写出答案）
• 英语翻译1 in how many of integers between 1 and 100 does the digit 5 occur exactly once?A 10 B 18 C 19 D 20 E 21 为什么选B?2 What is the total number of different 5-digit numbers that contain all of the digis 2,3,4,7 and 9 and in which none of the odd digits occur next to each other?A 12 B 10 C 8 D 6 E 1 为什么选A?此题没读懂?3 the value of y will decrease as the value of x increases in which of the following equations?A y=x B y=x-2 C 2-y=3-x D 2x-y=4 E x+2y=1 为什么选E而不选
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• 英语翻译How many 3-digit numbers have only one digit 5 in them?
• How many 3-digit numbers have exactly one digit 5 in them
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