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exercitiul 1
a)5X+17X=
b)6a-18b=
c)3a+18b-12c=
exercitiul 2
daca X+y+z=17 calculati:
a)5X+5y+5z+
b)13X+13y+13z-1313=
c)882-3 x(7 x X+7 x y+7 x z)=


Răspuns :

Exercitul 1:
a)
5x+17x=x(5+17)=22x
b)
6a-18b=6(a-3b)
c)
3a+18b-12c=3(a+6b-4c)
Exercitiul 2:
x+y+z=17
a)
5x+5y+5z=5(x+y+z)=5x17=85
b)
13x+13y-13z-1313=13(x+y+z)-1313=13x17-1313=221-1313=-1092
c)
882-3(7x+7y+7z)=882-3x7(y+y+z)=882-3x7x17=882-357=525