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odp: drzewo zlamało sie na wysokości 9,1 m.
mamy więc, że x+y=20m
x=20m-y
teraz tak:
x²+(6m)²=y²
(20m-y)²(6m)²=y²
400m²-40my+y²+36m²=y²
436m²=40my /40m
y=10,9m
x=20m-y
x=20m-10,9m=9,1m