how many natural numbers whose ten digits are smaller than the ones digits are there from 10 to 99?翻译这句话.

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how many natural numbers whose ten digits are smaller than the ones digits are there from 10 to 99?翻译这句话.

从10到99的自然数里,有多少个数,其中十位数比它的个位数小?
这里的ten digits 是十位数,
ones digits 是个位数

从10到99之间，有几个自然数的十位数是小于个位数的？

10到99之间，有多少个十位小于个位的自然数

1.how many people in quebec? 2.how many people live?3.what important natural resources ? how many natural numbers have an odd number of factorshow many natural numbers between 0 and 100 have an odd number of factors? how many how many, how many natural numbers whose ten digits are smaller than the ones digits are there from 10 to 99?翻译这句话. how many how natural natural natural natural natural natural natural How Many Times,How Many Lies 歌词 填空：Birds are the natural (e ) of many insect pests. how do you survive a natural disaster什么意思 The perimeter of a rectangle is 22 inches and the inch-measure of each side is a natural number.How many different areas in square inches can the rectangle have? How many?的中文.