Can I buy an backwards compatible game on xbox one, then download it on my 360?

Buying a 360 game on Xbox.com adds the game to your download queue on the 360, so the next time the console switches on it can begin downloading. The ''ready to install'' list on Xbox one runs from your purchase history. So as long as the game you are buying
IS backwards compatible, It should work.

For a full list of current backwards compatible titles, Hit this link.
www.xbox.com/.../backward-compatibility

Hope this Helps!

There is not a One version of the game, but the 360 version is backwards compatible so it will play on the One.

Thanks for your answer. So if I buy the game I can download it on my Xbox One despite I can't find it on Xbox One store? I think if the game is backward compatible it would also be available in the Xbox One store. Or am I wrong?

It's not gears 3, (for as far as i know gears 3 is not backwards compatible)

I can't download any backwards compatible game.

Is there another way then to log in on a xbox 360 console? like if i buy a physical disc of a backwards compatible game, would it work then? and would i be able to download 360 games after that.

....If it is backwards compatible you should be able to download it on pc. Here is the official website for all the backwards compatible games. https://www.xbox.com/en-US/xbox-one/backward-compatibility.
I hope this helps you out.

Not sure what you mean by that?

Xbox 360 games can only be downloaded on either a 360 or, if they are backwards compatible, on an Xbox One.

Xbox 360 game codes do not work on PC.

You can of course redeem codes for consoles using a PC web browser (or a browser on any device for that matter), but the game will only be downloadable on a compatible Xbox console.

The 360 store and the One store are set up differently. Due to restrictions on child accounts for the 360 store that can't be adjusted on the One, you can't download backwards compatible games. You can get them through a 360 console.

Can i then buy the 360 disc for the game and then put it in my xbox one and it will work?