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1+1,2+3=5,2
39....5,2
x.......1 x=39*1/5,2=7,5 3*7,5=22,5 7,5*1,2=9
Zad.29
chłopak=x
dziadek=10x
ojciec=6x
x+10x+6x=17x wielokrotności liczby17=34,51,68,85,102,119....
85<17x<119 17x=102 x=102/17 x=6