If your playin in a band situation you don't necessarily need to play the bass note indicated, it will be provided by the bass player & will have the same effect (Chords that do not have the root in the bass often sound unstable & want to resolve elsewhere)

Here's some terms you should be familiar ;
1) E/A is known as a slash chord
2) a chord that does not have the root as the bass is known as a inversion