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b = 10 dm
(* = liczba podniesiona do kwadratu)
(x = razy)
h* = b* - 1/2a*
h* = 10* - 1*
h* = 100 - 1
h* = 99
h = (3 pierwiastki z 11) dm
P = 5 x 1/2 x a x h
P = 5 x 1/2 x 2 x 3 pierwiastki z 11
P = (15 pierwiastków z 11) dm 2