Question

1.Efectuati calculele:clasa a VIII.a

a.5$a^{3}$:$a^{2}$+$a^{2}$-a-4$a^{3}$:4a-3a-a=
b.2(5$x^{2}$-3)-4($x^{2}$-1)=
c.(x+7)(2x-2)-($\sqrt{2} x)$2=

Answer 1

b.2(5 x² -3)-4( x² -1)=
=10x²-6-4x²+4=
=6x²-2=
=2(3x²-1)

c.(x+7)(2x-2)-( √2x)^2=
=2x²+14x-2x-14-2x²=
=12x-14=
=2(6x-7)