Formal:
* 您好吗?(Nín hǎo ma?) - This is the most formal and polite way to ask. It literally means "Are you well?"
* 您最近怎么样?(Nín zuìjìn zěnmeyàng?) - This is also formal and means "How are you doing these days?"
Informal:
* 你好吗?(Nǐ hǎo ma?) - This is a more casual way to ask, similar to "How are you?" in English.
* 最近怎么样?(Zuìjìn zěnmeyàng?) - This is informal and means "How are you doing lately?"
* 怎么样?(Zěnmeyàng?) - This is very casual and can be used with friends or family. It literally means "How?"
Other options:
* 身体还好吗?(Shēntǐ hái hǎo ma?) - This means "Are you feeling well?"
* 最近过得怎么样?(Zuìjìn guò de zěnmeyàng?) - This means "How have you been lately?"
The best way to choose which phrase to use depends on who you are speaking to and the situation.