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P = 0,5*a*(a-4)
P = 0,5a(a-4)
P = 0,5a²-2a
po zmianie:
P = 0,5*a*(a-4+10)
P = 0,5a(a+6)
P = 0,5a²+3a
(0,5a²+3a)-(0,5a²-2a) = 0,5a²+3a-0,5a²+2a = 5a [cm²]