Which is the best way to ask a question in a polite way; for example, I want to write an email to someone that doesn't know me, and to ask something...
Is okay to say write this:
Sorry to disturb you, Can I ask you a question about "something"?
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Yes, what you're writing would probably be fine, though it would depend on the person you are writing to and anything you know about them might affect your choice. For example:
Sorry to disturb you... Can I ask you a question about [something]?
Would likely be fine and a half-way house between formal and informal, which would seem likely appropriate in this situation.
You could also try:
Hi, you don't know me but I'd like to ask your opinion on [something].
I found your details/e-mail address [somewhere] and I was wondering if it would be ok to ask you [something]...
There are probably others too, but these would usually all be perfectly acceptable.