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=25x2 +5xy+1/4y2
=16x2-16xz+4z2
=1/4-y2+y4
=1/4a2+1/3ab+1/9b2
2=do kwadratu
4=do 4 potegi
(5x+1/2y)2=25x2+2x+1/4y2
(4x-2z)2=16x2-16xz+4z2
(1/2x-y2)2=1/4x2-1/x*y2+y4
(1/2a+1/3b)2=1/4a2+1/3ab+1/9b2