1.Se da proportia a supra b = c supra d .Aratati ca : 5a+2b supra 13a+7b = 5c+2d supra 13c +7d .

2. Determinati x,y si z, stiind ca x-y supra 2 = y+z supra 8 =z supra 6 si x+2z=48.

Va rog ajutati.ma multumesc .
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