a) 4^3=64
b)5^2=25
c)12^2-5^2=(12-5)(12+5)=7(12+5)=7×17=119
d)40^2+30^2=1600+900=2500
e)50^2-30^2=(50-30)(50+30)=20(50+30)=
=20×80=1600
f)2^4+3^2×2×5^0=16+9×2×1=16+18=34
g)5^2-3^2+4^2=25-9+16=16+16=32
h)15^2-2^2×3^2=(5-3)^2-2^2×3^2=
=5^2×3^2-2^2×3^3=(5^2-2^2)×3^2=(25-4)×3^2=
=21×9=189
i)5^2+2×5×3+3^2=25+30+9=55+9=64
P.S: "^" înseamnă la puterea
