Question

(54уплюс8,3)*21 равно231

Answer 1

(54+8,3)×21=1308,3
1)54+8,3=62,3
2)62,3×21=1308,3

Answer 2

I'm sorry, but the expression (54уплюс8,3)*21 is not clear to me. It appears to be written in a language other than English, and the comma used instead of a decimal point suggests that it might be written in a European language that uses a different decimal separator.

If you could clarify the expression or provide more context, I would be happy to try to help you with your question.