Răspuns:
a)
4×3=12
8×3=24
7×3=21
9×3=27
12×3=36
15×3=45
b)
8×4=32
5×4=20
12×4=48
15×4=60
21×4=84
19×4=76
4x3=12 , 12x3=36
7x3=24 , 24x3=72
7x3=21 , 21x3=63
9x3=27 , 27x3=81
12x3=36, 36x3=108
15x3=45 , 45x3=135
8x4=32 , 32x4=128
5x4=20 , 20x4=80
12x4=48 , 48x4=192
15x4=60 , 60x4=240
21x4=84 , 84x4=336
19x4=76 , 76x4=304
