2,1 ⋅ 3a = 6,3a
3,2 ⋅ 2b = 6,4b
2k ⋅ 4,1 = 8,2k
3x ⋅ 2 ⋅ 0,12 = 6x ⋅ 0,12 = 0,72x
2,5 ⋅ 1y ⋅ 3 = 7,5y