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Fie x÷z-y÷z=5 si x-y=20.Determina z..URGENT!DAU COROANA

Răspuns :

x/z-y/z=5
x-y=20

inmultesti prima ecuatie cu z

=> x-y=5z
     x-y=20
=>5z=20 => z=4
(x-y)/z=5=> 20/z=5=>z=4