A question about a queen’s gambit declined variation

so I found a variation of the queen’s gambit declined 1. d4 d5 2. c4 c5 and I found some lines that could happen. do you think that they have a decent chance of occurring or have a good advantage:

Or maybe something more like this:

(with the intention of taking the c5 pawn)

#1
3 cxd5 Qxd5 4 Nf3 cxd4 5 Nc3 Qa5 6 Nxd4 gives white an advantage in development.

thanks! I’ll try to find some counters to this or a way to avoid that position now

I think 3. cxd5 nf6  4. dxc5 nxd5 might create a more equal position. After this black could try to play e5 or e6 to try to gain some control in the centre, and threaten the c5 pawn. after white’s next move, could black play something like na6 (unless it blunders something or white doesn’t protect the c5 pawn)to build pressure on the c5 pawn or is it just a bad idea to put the knight on the edge of the board?

#4
1 d4 d5 2 c4 c5 3 cxd5 Nf6 4 e4 Nxe4 5 dxc5 Qa5+ 6 Bd2 Nxd2 7 Qxd2 Qxd2+ 8 Nxd2
Is very good for white: a solid pawn up, but black has the bishop's pair.

thanks, im just gonna hope that no one at my level plays e4  

I really dislike how white plays in these variations. Bad pawn structure. 

This is better for white: 

Qd3 was played by Mamadiarov

hmm so what would actually be good for black to play?

#8
1 d4 d5 2 c4 e6 3 Nc3 c5 is good. The difference is that your pawns d5 and c5 are then protected by pawn e6 and Bf8 respectively.

ok

I’ll try some games now and see how it works