a) 25×6+25×9+25×10=
=150+225+250=
625=25^2
625=25 la puterea a doua
Patrat perfect.
b) 373+373+2+373×4=
373+373+2+1372=2120
2120=2^3×5×53
Nu este patrat perfect
c)2+2+4+8+16+32=64=
=8×8=8^2
Patrat perfect
d) 25=5×5=5^2
Patrat perfect
e) 8+2×28=
=8+56=64=8×8=8^2
Patrat perfect
