Reduceti termenii asemenea
a)7x+2y-4z-5x+6y+3z
b)3a-9b+2a+7b-4a-5b
c)8x-3y-5z-9x-4y+3z
va rog ajutatima


Răspuns :

a)7x+2y-4z-5x+6y+3z=
=7x-5x+2y+6y-4z+3z=
=2x+8y-z

b)3a-9b+2a+7b-4a-5b=
=(3a+2a-4a)-2b-5b=
=a-7b

c)8x-3y-5z-9x-4y+3z=
=-x-7y-2z