How does MMR work !?

So acording to my mmr was 1970, i won 1 game and lost the game after that and it says my mmr is 1940 now. WHen i read about mmr it should climb for 1 winn and 1 lose but sometimes i need to winn 2 games only to compensate for the 1 loss i had. ALso i know ain't precice but i cant feel my mmr being low due to geting less and less lp by constantly winning and losing 1 game in row. Is riot even doing their job with ranked que. Sometimes my whole team is plat 1-2 and 1 random gold 1 player and i still get low lp and mmr for being full plat 1 - dia team... Can someone explain whats going on with ranked these weeks !?
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