Răspuns :
Explicație pas cu pas:
a 27 18 21 28 15 30
b 3 4 7 8 2 9
c 18 21 30 12 11 10
d 18 9 24 12 21 6
a) 9x3=27
6x3=18
7x3=21
8x3=24
5x3=15
10x3=30
b) 9:3=3
12:3=4
21:3=7
24:3=8
6:3=2
27:3=9
c) 15+3=18
18+3=21
27+3=30
9+3=12
8+3=11
7+3=10
d) 21-3=18
12-3=9
27-3=24
15-3=12
24-3=21
9-3=6