Vektorrechnung

(2,5,4,7) + (3,1,3,1) = (5,6,7,8)
(2,5,4,7) - (3,1,3,1) = (-1,4,1,6)
(2,5,4,7) * (3,1,3,1) = 30
5 * (2,5,4,7) = (10,25,20,35)