Formal:
* Як справи? (Yak spravy?) - This is the most common and polite way to ask "how are you?".
Informal:
* Як ти? (Yak ty?) - This is a more casual way to ask "how are you" and is used with friends and family.
Here are some other ways to ask how someone is doing in Ukrainian:
* Як у вас справи? (Yak u vas spravy?) - This is a formal way to ask "how are you?" to multiple people.
* Що нового? (Shcho novoho?) - This means "what's new?" and is a good way to ask how someone is doing in a casual setting.
* Як твої справи? (Yak tvoyi spravy?) - This is a more familiar way to ask "how are you" to someone you know well.
It's important to choose the right phrase based on your relationship with the person you're talking to.