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Calculati suma tuturor numerelor xy , stiind ca xy=4x+3y

Răspuns :

xy=4x+3y
10x+y=4x+3y
10x-4x=3y-y
 6x=2y 
 6x1=2x3
 6x2=2x6
 6x3=2x9
 xy={13,26,39}