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6,3=1,8x
x=3,5
Odp wysokość drzewa to 3,5 m
1.8/4.2+1.8=1.5/x
1.8/6=1.5/x
1.8x=9/:1.8
x=5
P.S. nie wiem czy to jest dobrze :)
1,8x =4,2m *1, 5m
1,8x =6,3m
x= 6,3 / :1,8
x=3,5m