a)
Relatia se mai poate scrie:
ab²
-
bc²
=abc
ab+2
=abc
ab²
100a+bc×(BC+1)
U(
ab²
)={0,1,4,5,6,9},U(100a+BC(BC+1))={0,2,6} si b
≠
0=>b{4,6}
b=4=>
a4²
=100a+
4c²
+4c)
≠
5a=6=>
64²
>900+
49²
+49
b=6=>
a6²
=100a+
6c²
+6c
a=6=>c€{2,7} si
66²
≠
500+6c×(6c+1)
a=7=>
76²
>900+
69²
+62=>nu se verivica relatia