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3/3,9=10/x
3x=39/3
x=13m
wierza ma 13 metrów
z talesa:
3,9:3=x+3,9:10
3(x+3,9)=3,9×10
3x+11,7=39
3x=39-11,7
3x=27,3
x=27,3:3
x=9,1m
wieża ma 3,9m+9,1m=13metrów