Question

1.Daca x+y+z=17,calculati
a) 5•x+5•y+5•z=
b)13•x+13•y+13•z-1313=
c)882-3•(7•x+7•y+7•z)=

Answer 1

x+y+z=17
a) 5x+5y+5z=17x5=85
b) 13x+13y+13z-1313=13x17-1313=221-1313=-1092
c) 882-3(7x+7y+7z)=882-3(17x7)=882-3x119=882-357=525

Answer 2

$x+y+z=17 \\ a).5x+5y+5x=5(x+y+z)=5*17=85 \\ b).13x+13y+13z-1313=13(x+y+z)-1313= \\ =13*17-1313=221-1313=-1092 \\ c).882-3(7x+7y+7z)=882-3[7(x+y+z)]= \\ =882-3(7*17)=882-3*119=882-357=525$