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a fost răspuns

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

Multumesc!

Răspuns :

a) 5•x+5•y+5•z=5(x+y+z)=5*17 = 85
b)13•x+13•y+13•z-1313=13 (x+y+z)-1313=13*17-1313=
221-1313=-1092  
c)882-3•(7•x+7•y+7•z)=882-3( 7(x+y+z) )=882-3(7*17)=882-3*119=
882-357=525
         Bafta!!
Lydya25
a)5(x+y+z)=5×17=85
b)13(x+y+z)-1313=13×17-1313=221-1313=-1092
c)882-3×7(x+y+z)=882-3×7×17=882-357=525

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