How many number '9' are required to represent the numbers between 10 to 100?

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How many number '9' are required to represent the numbers between 10 to 100?

How many number '9' are required to represent the numbers between 10 to 100?
How many number '9' are required to represent the numbers between 10 to 100?

How many number '9' are required to represent the numbers between 10 to 100?
喂喂.楼上的你好好数一数好不.
问题翻译过来是问你如果想要把10到100之间所有数写出来需要多少个9.
19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99
这一共是19个啊. 99是两个9.

19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99
所以应该是18 个