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bok a = 2a
bok b= x
6ab-4a kwadrat = 2a * x
x= (6ab-4a kwadrat) : 2a = 3b - 2a
sprawdzenie 2a *(3b-2a) =6ab - 4a kwadrat
obwód tego prostokąta =2* 2a +2*(3b-2a) = 4a + 6b -4a = 6b