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DOAReu34
a fost răspuns

Hei am nevoie de ajutor.. cei drept stau prost cu matemeatica :
a) 2(3a+9b-7c) - 3(4a+5b+9c) - 5(a+2b-8c)
b) 3(5x-2y+5z) - 5(4x+3y-2z) - 6(2x-4y+6z)

Răspuns :

Danghinea74

a) 2(3a+9b-7c)-3(4a+5b+9c)-5(a+2b-8c)
  6a+18b-14c-12a-15b-27c-5a-10b+40c=
   -11a-7b-c
b) 3(5x-2y+5z) - 5(4x+3y-2z) - 6(2x-4y+6z)
    15x-6y+15z-20x-15y+10z-12x+24y-36z=
     -17x+3y-11z
    

Cristi997
6a+18b-14c-12a-15b-27c-5a-10b+40c=-11a-7b-c
15x-6y+15z-20x-15y+10z-12x+24y-36z=-17x+3y-11z

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