First of all, keep in mind that a major chord contains 1-3-5 scale degrees of any key:
Eb / Ab-Bb-C-Eb
In the LH, we have an Eb, which is the 1st scale degree in the key of Eb. In the RH, we have an Abadd9 chord, which is a 4 chord in Eb w/the added 9th, Bb. Since Eb is a note in the 4 chord, we are actually playing an inversion of the 4 chord, w/the 5th being in the bass. Since the 1st scale degree is in the bass, the entire chord is a 1.
O.K, in this chord, I mean the 5th of the Ab chord. In the key of Ab, your scale degrees are: Ab=1 Bb=2 C=3 Db=4 Eb=5 F=6 G=7 So, when you play the 4 chord, you are playing the 5th of that chord in the bass, not the 5th of Eb.
C / Eb-Ab-C
In the LH, we have a C, which is the 6th scale degree in the key of Eb. In the RH, we have an Ab major chord, which is a 4 chord in Eb. Since C is a note in the 4 chord, we are actually playing an inversion of the 4 chord, w/the 3rd being in the bass. Since the 6th scale degree is in the bass, the entire chord is a 6.
O.K, in this chord, I mean the 3rd of the Ab chord. In the key of Ab, your scale degrees are: Ab=1 Bb=2 C=3 Db=4 Eb=5 F=6 G=7 So, when you play the 4 chord, you are playing the 3rd of that chord in the bass, not the 3rd of Eb.
D / F-Bb-D
In the LH, we have a D, which is the 7th scale degree in the key of Eb. In the RH, we have an Bb major chord, which is a 5 chord in Eb. Since D is a note in the 5 chord, we are actually playing an inversion of the 5 chord, w/the 3rd being in the bass. Since the 7th scale degree is in the bass, the entire chord is a 7.
O.K, in this chord, I mean the 3rd of the Bb chord. In the key of Bb, your scale degrees are: Bb=1 C=2 D=3 Eb=4 F=5 G=6 A=7 So, when you play the 5 chord, you are playing the 3rd of that chord in the bass, not the 3rd of Eb.
Is that better?