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a =x
b = 2x
c= x-1
Pc = 2(ab + bc + ac)
Pc = 2[x * 2x + 2x*(x-1) + 2x * (x-1)]
Pc =2( 2x^ + 2x^ - 2x +2 x^ -2x)
Pc = 2(6x^ -4x)
Pc =12x^ -8x
(^ oznacza do kwadratu)