a) 6,75kg + 6,75kg + 6,75kg = 6,75kg x 3 = 20,25kg.
b) 7,14m2 + 7,14m2 + 7,14m2 x 3 = 7,14m2 x 1+ 7,14m2 x 1+ 7,14m2 x 3
= 7,14m2 x ( 1 + 1 +3) = 7,14m2 x 5 = 35,7m2 .
c) 9,26dm3 x 9 + 9,26dm3 = 9,26dm3 x 9 + 9,26dm3 x 1= 9,26dm3 x (9 + 1)
= 9,26dm3 x 10 = 92,6dm3.