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Dinozaur012
a fost răspuns

x*y=xy-4(x+y-5)


aratati că x*y=(x-4)(y-4)+4

Răspuns :

Albatran
CALCUL DIRECT (clasa  a 7-a)

x*y=xy-4x-4y+20

(x-4)(y-4)+4=xy-4x-4y+16=4=xy-4x-4y+20=x*y
as simple as that!

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