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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howmanynaturalnumberswhosetendigitsaresmallerthantheonesdigitsaretherefrom10to99?翻译这句话.howmanynatura

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

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