Question

daca x+y+z=17,calculați: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=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+7x=882-3*7(x+y+z)==882-3*7*17=
=882-21*17
=882-357
=325