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a fost răspuns

Daca:
x+y=17
x+z=28
y+z=15
atunci
2x+2y+2z=?
3x+3y+3z=?
3x+5y+2z=?

Răspuns :

Gicu1973
2x+2y+2z=2*(x+y+z)=2*(17+z).z=34;3x+3y+3z=3(x+y+z)=3(Y+28)deci 3y=3*28deci y=84\3=28;3x + 5y +2z=3x+7*15=3x+105=105\3 deci x=35

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