Question

Efectuati calculele si reduceti termenii asemenea:
a)2(3a-4b)-3(a-2b)+4(-2a+2b)
b)4(3x+2y)-5(2x-3y)+3(-4x-5y)
c)-3(x²-2)+6(x²-1)-4(x²+3)+(x²-4)

Answer 1

a)2(3a-4b)-3(a-2b)+4(-2a+2b)=
=6a-8b-3a+6b-8a+8b=
=-5a+6b

b)4(3x+2y)-5(2x-3y)+3(-4x-5y)=
=12x+8y-10x+15y-12x-15y=
=8y-10x

c)-3(x²-2)+6(x²-1)-4(x²+3)+(x²-4) =
=-3x²+6+6x²-6-4x²-12+x²-4 =
=-16