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x+3y=2y+z=14
a)x+5y+z=?
b)3x+15y+3z=?
c)5x+11y-2z=?
d)5x+19y+2z=?


Răspuns :

a) x+5y+z
(x+3y)+(y2+z)=
14+14=28
b) 3x+15y+3z=
(3x+9y)+(3z+6y)
(3*14)+(3*14)
42+42=84
d)5x+19y+2z=
(5x+15y)+(2z+4y)=
(5*14)+(2*14)=
70+28=98
scz ,dar la c) nu prea stiu cum sa il fac