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英语翻译how many integers between 9 and 100 have the tens digit equal to 4 or 5 and the units digit(ones digit ) equal to 7,8 or

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英语翻译
how many integers between 9 and 100 have the tens digit equal to 4 or 5 and the units digit(ones digit ) equal to 7,8 or
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答案和解析
从9到100中有多少个整数的十位数等于4或者5并且个位数等于7,8或者9的?