You're right, real betis is a Big threat to real madrid so I don't think if real madrid can win them so easily considering the home advantage that was given to real betis. Moreover I think real betis is among the thougest team in la liga this season, secondly they are in a very good performance. so the possibility of real madrid wining real betis is 40%. Well let me not go much further, I think the end will justify.
You may not be aware of the capabilities of Real Madrid. Real Madrid may not be at their best, but that does not mean that Real Betis is a threat to them. They may be a bit of a tough opponent for Real Madrid, but I do not see them as a big threat to Real Madrid. Considering Real Betis' recent form, they will definitely play competitive football against Real Madrid and will give Real Madrid a big challenge, but Real Madrid has the full ability to face that challenge.
Among the top 3 teams, Barcelona has a relatively weak opponent, meaning they have the most chances to fight for the top position and Atletico Madrid has the least chances.