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a*b*c=1728
a/b=b/c =>a=b^2/c
b=42-a-c
b^2/c*b*c=1728 =>b^3=1728 =>b=12
a=42-b-c
a=42-12-c
a=30-c
30-c=b^2/c
30-c=144/c
144=30c-c^2
c^2-30c+144=0
delta=324
pierwiastek z delta=18
c1=6, c2=24
a=42-b-c=42-12-6=24 lub a=42-12-24=6
odp: liczby to 6,12,24 lub 24,12,6 :)