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a = 1/4
b = 2
[(-1/4)2 + 2 x 1/4 x 2 - 1] + [(1/4)2 - 4 x 1/4 x 2 +5] = ( - 1/16 + 1 - 1) + (1/16 - 2 + 5) = (-1/16) + 3 1/16 = 3
dla a=¼ i b=2
-2*¼*2+4 = -1+4 = 3