PLPGSQL: DECLARE more variable with same type at once

[Durumdara]

Hello!

I want to ask how to shortening code?

    Delta double precision;
    UjErtek double precision;
    UjDErtek double precision;

For example - but this makes an error:
    Delta, UjErtek, UjDErtek double precision;

Do you know any other form?

Thank you for it!

Best regards
   dd