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x/4=y/6=z/8=5/9 ,aflati x+y+z (lectia este sir de rapoarte egale)

Răspuns :

X/4=y/6=z/8= (x+y+z)/(4+6+8)= 5/9= (x+y+z)/18=5/9 --> (x+y+z)=18•5/9= 2•5= 10