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x:z-y=5 six-y=20.determina z

Răspuns :

x:z-y=5 Y=20 X:z-20=5|+20 X:z=25 Deci x:z= 25 X = x supra 1 = x= 1k Z= z supra 1 = y = 1k 1k÷1k=25 1k=25 K=25 Rezulta: z=1; y=25