11 raportul dintre pretul unui pix si stilou
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Răspuns:
[tex]p/s=2/7= > p=2s/7\\\\p+s=18\\\\2s/7+s=18\\\\numitor.comun-7\\\\2s+7s=126= > s=126:9=14lei-stiloul\\\\18-14=4lei-pixul[/tex]