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a supra 4=b supra 7 ,b supra c = 7 supra 9 si a supra 2 +b supra 3,5+c supra 4,5 =30 aflati nr a,b,c repede va rog

Răspuns :

a/4=b/7 ----------a=(4*5,4)/7 --------a=151,2


b/7=7/9 ---------- b=(7*7)/9 ----------b=5,4


{a/(2+b)}*{(3,5+c)/4,5}=30 --------------- (151,2/7,4)*{(3,5+c)/4,5}=30-----------{151,2(3,5+c)}/33,3=30-------------151,2(3,5+c)=999------------------------------3,5+c=6,60--------------------------- c=3,1

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