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a/b=5/6
a+b=16,5
a = 5/11 x 16,5 = 7,5 [cm]
b = 6/11 x 16,5 = 9 [cm]
a,b - podstawy
P = 33cm²
4cm(5x + 6x) / 2 = 33cm² ||x2cm
4(5x + 6x) = 66cm
20x + 24x = 66cm
44x = 66cm ||:44
x = 1,5cm
a = 5x
a = 7cm
b = 6x
b = 9cm
Odp.: Długości podstaw to 7cm i 9cm. ;)