a) (128:32-93:31)²*(210:14-65:13):2=
= (4-3)²*(15-5):2=
=1²*10:2=
=1*10:2=
=10:2=5
b) P₁ 6²+8²=10² Adevarat
(3*2)²+(4*2)²=
=3²*2²+4²*2²=
=(3²+4²)*2²=
=(9+16)*4=
=25*4=100 (adica 10²)
P₂ (25-10)²=152 Fals
(25-10)² = 15²=225
P₃ (8+3)²=(4-9)² Fals
(8+3)²=11²=121
(4-9)²=(-5)²=25
P₄ 3*5³-4*5²=275 Adevarat
(3*5-4)*5²=
=(15-4)*25=
=11*25=
=275
P₅ 5²-3²=25-9=16 Fals
(5-3)²=2²=4
P₆ (9-4)²=5²=25 Fals
(7-3)²=4²=16
