a) a × 5 = 45
a = 45:5
a = 5
b) 8 × a = 64
a = 64:8
a = 8
c) 54 : a = 9
a = 54:9
a = 6
Răspuns:
a×5=45
a=45:5
a=9
9×5=45
8×a=64
a=64:8
a=8
8×8=64
54:a=9
a=54:9
a=6
54:6=9
