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Stiind ca x+2y=17 si y+3z=9,calculati 2x+6y+6z este o ecuatie dau coronita daca imi explicati cum ati facut!!!

Răspuns :

x+2y=17
y+3z=9

2x+6y+6z=
=2x+(4y+2y)+6z=
=(2x+4y)+(2y+6z)=
=2(x+2y)+2(y+3z)=
=2•17+2•9=
=34+18=
=52