Question

>или < 3дм8см......40 мм

Answer 1

3дм8см больше 40мм
это даже первокласник знает

Answer 2

I'm sorry, but I'm not sure what you're asking. The symbols "> или <" are commonly used in mathematical notation to indicate "greater than" or "less than", respectively.

However, the rest of the expression, "3дм8см......40 мм", is not clear to me. It appears to be a combination of measurements in centimeters and millimeters, but the ellipsis in the middle makes it difficult to interpret the meaning.

Please provide more context or clarification so I can better understand what you're trying to ask.