China Math Olympiad | A Nice Algebra Problem

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[@YAWTon]

It is well known (and easy to prove) that n-digit numbers of the form 66...67 lead to number of the form 44...488..9 n 4's, n-1 8's and one 9. So the answer to the problem is 66667. Similarly, 333...4 squared has the form 1111...55556.

[@22-kn4vd]

Кому -то известно, а кому-то нет

[@листикБомБом]

Спасибо за интересные задачи!

[@22-kn4vd]

Прямо любовалась

[@kiyotaka-z6q]

❤❤❤

[@RyanLewis-Johnson-wq6xs]

Sqrt[4444488889]=66667 and not -66667 because of principle root.

[@Iloveminecraftverymuch]

How's the song called?

[@ИринаРзаева-ф2с]

Ответ т/3